Replace deprecated set-output with GITHUB_OUTPUT

Author: hugovk

.github/workflows/test.yml

@@ -80,7 +80,7 @@ jobs:
       - name: Get pip cache dir
         id: pip-cache
         run: |
-          echo "::set-output name=dir::$(pip cache dir)"
+          echo "dir=$(pip cache dir)" >> $GITHUB_OUTPUT
 
       - name: Cache
         uses: actions/cache@v3