Update windows.yml

Author: AlbrechtL

.github/workflows/windows.yml

@@ -38,7 +38,7 @@ jobs:
             
             echo Create version
             $file_version="$($current_date)_$($git_hash)"
-            "file_version=$file_version" >> $$env:GITHUB_ENV
+            "file_version=$file_version" >> $env:GITHUB_ENV
             
             echo Create a build directory
             cd ..\