Update .github/actions/environment/action.yml

Co-authored-by: Stefan Pölz <[email protected]>

Author: jpnurmi

.github/actions/environment/action.yml

@@ -99,7 +99,7 @@ runs:
     # .NET 5.0 does not support ARM64 on macOS
     - name: Install .NET 5.0 SDK
       if: ${{ runner.os != 'macOS' || runner.arch != 'ARM64' }}
-      uses: actions/setup-dotnet@v4
+      uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4.3.1
       with:
         dotnet-version: 5.0.x