fix: Use bash to expand glob in NuGet push step (#995)

PowerShell doesn't glob-expand arguments to external commands, so
`bin/*.nupkg` was passed to dotnet nuget push literally on windows-latest,
which failed to resolve the wildcard itself and errored with
"File does not exist (bin/*.nupkg)" even though the package existed.

Author: zvirja

.github/workflows/release_packages.yml

@@ -40,6 +40,7 @@ jobs:
           user: ${{ secrets.NUGET_USER }}
 
       - name: Push packages to NuGet.org
+        shell: bash
         run: dotnet nuget push bin/*.nupkg --source https://api.nuget.org/v3/index.json
         env:
           NUGET_API_KEY: ${{ steps.nugetLogin.outputs.NUGET_API_KEY }}