etl: update to v20.40.0 (#6434)

packages/e/etl/xmake.lua

@@ -7,6 +7,7 @@ package("etl")
     add_urls("https://github.com/ETLCPP/etl/archive/refs/tags/$(version).tar.gz",
              "https://github.com/ETLCPP/etl.git")
 
+    add_versions("20.40.0", "b47ca70e7394f50dd2d65dddfd088757525488ac2fd934f435705fbf3ffe6d3d")
     add_versions("20.39.4", "ce1222ed12fb39ae7a6160f8c33da61534d6b4c4d0d36be622910bbd545f5ee7")
     add_versions("20.39.3", "1d596bc47d17959ced8b4586e0ae22348c903df6ab00f47ef900d854ef5e30c8")
     add_versions("20.39.2", "b1faad1b83382bc7e06df0892b0efe1bd62e8dafe490878b601188f144bef063")