Replace deprecated github actions ::set-output (#6509)

* Replace deprecated github actions ::set-output

Signed-off-by: Sebastian Malton <sebastian@malton.name>

* Update to newer versions to remove notices

Signed-off-by: Sebastian Malton <sebastian@malton.name>

* Fix getting cache dir on windows

Signed-off-by: Sebastian Malton <sebastian@malton.name>

Signed-off-by: Sebastian Malton <sebastian@malton.name>

.github/workflows/require-milestone.yml

@@ -6,7 +6,7 @@ jobs:
   milestone:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Require Milestone
         run: |
           exit $(gh pr view ${{ github.event.pull_request.number }} --json milestone | jq 'if .milestone == null then 1 else 0 end')