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

.github/actions/setup-polaris/Dockerfile

@@ -1,6 +1,6 @@
 # The action uses an own Dockerfile on purpose because the root Dockerfile takes way too long to build for an action
 
-FROM alpine:3.10
+FROM alpine:3.17
 
 RUN	apk add --no-cache \
   bash \

.github/actions/setup-polaris/get_polaris.sh

@@ -17,4 +17,4 @@ mkdir polaris
 tar -xzf $TARGET_FILE -C polaris
 rm $TARGET_FILE
 echo "polaris" >> $GITHUB_PATH
-echo "::set-output name=version::$INPUT_VERSION"
+echo "version=$INPUT_VERSION" >> $GITHUB_OUTPUT

.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: