opam for windows is not updated yet

extra/github-actions/build-windows.yml

@@ -30,7 +30,7 @@
     & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'opam update --yes 2>&1')
     & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'cd "$OLDPWD" && opam pin add haxe . --kind=path --no-action --yes 2>&1')
     & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'opam install haxe --deps-only --yes 2>&1')
-    & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'opam pin add luv https://github.com/aantron/luv.git#44db25c2b2669f9d1373377006a4d5850e0820e3 --yes 2>&1')
+    & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'opam pin add luv https://github.com/aantron/luv.git#0.5.7 --yes 2>&1')
     & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'opam list')
     & "$($env:CYG_ROOT)/bin/bash.exe" @('-lc', 'ocamlopt -v')