chore(ci): Upgrade Github CI/CD to non-deprecated actions (#933)

.github/workflows/stale.yml

@@ -11,7 +11,7 @@ jobs:
   stale:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/stale@v4
+      - uses: actions/stale@v7
         with:
           exempt-issue-labels: pinned
           stale-pr-label: stale

.github/workflows/test_setup.yml

@@ -7,7 +7,7 @@ jobs:
   build-int:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Setup polaris
         uses: ./.github/actions/setup-polaris
         with:
@@ -18,7 +18,7 @@ jobs:
   build-ext:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Setup polaris
         uses: fairwindsops/polaris/.github/actions/setup-polaris@master
         with: