upgrade yarn to patched version to solve

https://github.com/yarnpkg/berry/issues/2232

.yarnrc.yml

@@ -1,5 +1,9 @@
 
-yarnPath: .yarn/releases/yarn-2.3.3.cjs
+# !!!
+# We're running a custom-built version of yarn while waiting for this bugfix:
+# https://github.com/yarnpkg/berry/issues/2232#issuecomment-752052924
+# !!!
+yarnPath: .yarn/releases/yarn-sources.cjs
 
 plugins:
   - path: .yarn/plugins/@yarnpkg/plugin-version.cjs

yarn.lock

@@ -9840,13 +9840,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"fs-monkey@npm:1.0.1":
-  version: 1.0.1
-  resolution: "fs-monkey@npm:1.0.1"
-  checksum: 2ecb8ef5896fc66a5d6fbb9af6e1f9c5723b46ff46cbd91c815262c405318dad8cb6f1bbb36d9c63ec257131731fbdfa433683bc1fea34b4be17b07e64c826cc
-  languageName: node
-  linkType: hard
-
 "fs-write-stream-atomic@npm:^1.0.8":
   version: 1.0.10
   resolution: "fs-write-stream-atomic@npm:1.0.10"
@@ -9878,7 +9871,7 @@ fsevents@^1.2.7:
 
 "fsevents@patch:fsevents@^1.2.7#builtin<compat/fsevents>":
   version: 1.2.13
-  resolution: "fsevents@patch:fsevents@npm%3A1.2.13#builtin<compat/fsevents>::version=1.2.13&hash=127e8e"
+  resolution: "fsevents@patch:fsevents@npm%3A1.2.13#builtin<compat/fsevents>::version=1.2.13&hash=11e9ea"
   dependencies:
     bindings: ^1.5.0
     nan: ^2.12.1
@@ -9888,7 +9881,7 @@ fsevents@^1.2.7:
 
 "fsevents@patch:fsevents@~2.1.2#builtin<compat/fsevents>":
   version: 2.1.3
-  resolution: "fsevents@patch:fsevents@npm%3A2.1.3#builtin<compat/fsevents>::version=2.1.3&hash=127e8e"
+  resolution: "fsevents@patch:fsevents@npm%3A2.1.3#builtin<compat/fsevents>::version=2.1.3&hash=11e9ea"
   dependencies:
     node-gyp: latest
   checksum: e2b8c379340e21a786d32c653854c8876f94eb1202dd5be378fd42c062bc123aab5051c32bf0011865257c85982c41ded203f9fe8c9f9c8f8c84dc4672abc0e0
@@ -13873,7 +13866,7 @@ karma@~5.2.3:
   languageName: node
   linkType: hard
 
-"map-age-cleaner@npm:^0.1.1, map-age-cleaner@npm:^0.1.3":
+"map-age-cleaner@npm:^0.1.1":
   version: 0.1.3
   resolution: "map-age-cleaner@npm:0.1.3"
   dependencies:
@@ -14006,25 +13999,6 @@ karma@~5.2.3:
   languageName: node
   linkType: hard
 
-"mem@npm:^8.0.0":
-  version: 8.0.0
-  resolution: "mem@npm:8.0.0"
-  dependencies:
-    map-age-cleaner: ^0.1.3
-    mimic-fn: ^3.1.0
-  checksum: 94ebfc25f369fdd3c926bf7772d252e18cb0022b1d063db11fcfc4990483642e8df478222e169452e76a065df4d0c396a64d6f6d8978cd9902e53e28b7970a47
-  languageName: node
-  linkType: hard
-
-"memfs@npm:^3.2.0":
-  version: 3.2.0
-  resolution: "memfs@npm:3.2.0"
-  dependencies:
-    fs-monkey: 1.0.1
-  checksum: 48bf758246937c6ceadaecc31e81050d4745dac5e031e3080961c28311bcc4b29e99f9cc4110103a0cb9f004c30c59926eaf15d10f4ac9a00b773b256a918ae2
-  languageName: node
-  linkType: hard
-
 "memory-fs@npm:^0.4.1":
   version: 0.4.1
   resolution: "memory-fs@npm:0.4.1"
@@ -14203,13 +14177,6 @@ karma@~5.2.3:
   languageName: node
   linkType: hard
 
-"mimic-fn@npm:^3.1.0":
-  version: 3.1.0
-  resolution: "mimic-fn@npm:3.1.0"
-  checksum: 873b65357a72a69a4d13745963d43518878ca8ea1d025bb5a8d973fd78877bbcb692c4993b80b65d418c68829518320359402c49dc239ea50ed1146722a5411e
-  languageName: node
-  linkType: hard
-
 "mimic-response@npm:^1.0.0":
   version: 1.0.1
   resolution: "mimic-response@npm:1.0.1"
@@ -20993,17 +20960,17 @@ [email protected]:
 
 "typescript@patch:[email protected]#builtin<compat/typescript>, typescript@patch:typescript@^4.0.5#builtin<compat/typescript>":
   version: 4.0.5
-  resolution: "typescript@patch:typescript@npm%3A4.0.5#builtin<compat/typescript>::version=4.0.5&hash=5bf698"
+  resolution: "typescript@patch:typescript@npm%3A4.0.5#builtin<compat/typescript>::version=4.0.5&hash=cc6730"
   bin:
     tsc: bin/tsc
     tsserver: bin/tsserver
-  checksum: d4be0bd2a2050b2d7b132cb2a40329178f181543e9d2ac6d1f06babd9f047208558a736a7effdeb28759ae2e815f070b61d10ee2f02cc93a6221a1490f21ffce
+  checksum: ada6fea7657a51d1b842682d31233e53a3cf509b0edbd6288fda3cfd01643d0190b7ea77837527c4d282c90e61690e19dbfd91be6913e7e7292aa0b588d3506c
   languageName: node
   linkType: hard
 
 "typescript@patch:typescript@~3.9.7#builtin<compat/typescript>":
   version: 3.9.7
-  resolution: "typescript@patch:typescript@npm%3A3.9.7#builtin<compat/typescript>::version=3.9.7&hash=5bf698"
+  resolution: "typescript@patch:typescript@npm%3A3.9.7#builtin<compat/typescript>::version=3.9.7&hash=cc6730"
   bin:
     tsc: bin/tsc
     tsserver: bin/tsserver
@@ -21925,18 +21892,18 @@ typescript@~3.9.7:
   languageName: node
   linkType: hard
 
-"webpack-dev-middleware@npm:^4.0.0":
-  version: 4.0.2
-  resolution: "webpack-dev-middleware@npm:4.0.2"
+"webpack-dev-middleware@npm:^3.7.2":
+  version: 3.7.3
+  resolution: "webpack-dev-middleware@npm:3.7.3"
   dependencies:
-    mem: ^8.0.0
-    memfs: ^3.2.0
-    mime-types: ^2.1.27
+    memory-fs: ^0.4.1
+    mime: ^2.4.4
+    mkdirp: ^0.5.1
     range-parser: ^1.2.1
-    schema-utils: ^3.0.0
+    webpack-log: ^2.0.0
   peerDependencies:
     webpack: ^4.0.0 || ^5.0.0
-  checksum: 0499e034b0b0f02af251202dbe5189495c441584943a31a88f073d3f08f541e4312c2b0f6e958cfbdced28dd3115bc0d72939b2d13938fa5f161a2f7bee071eb
+  checksum: 10170e9149cf7b1232d53d3fcb8c687310546bec008992edfa8d6ffb878143d05956c21bc9b3dfcdb956509341f001b780a441b504d5e99e3a7748e602518a41
   languageName: node
   linkType: hard