Address GitHub action deprecation warnings (#4745)

* Remove deprecated set-output from GitHub actions

* Replace get-changed-files GitHub action

The GitHub action jitterbit/get-changed-files@v1 seems abandoned.
Use masesgroup/retrieve-changed-files@v3.0.0 which can be used as
a drop in replacement.

.github/workflows/builder.yml

@@ -70,13 +70,13 @@ jobs:
       - name: Get changed files
         id: changed_files
         if: steps.version.outputs.publish == 'false'
-        uses: jitterbit/get-changed-files@v1
+        uses: masesgroup/retrieve-changed-files@v3.0.0
 
       - name: Check if requirements files changed
         id: requirements
         run: |
           if [[ "${{ steps.changed_files.outputs.all }}" =~ (requirements.txt|build.json) ]]; then
-            echo "::set-output name=changed::true"
+            echo "changed=true" >> "$GITHUB_OUTPUT"
           fi
 
   build:
@@ -324,7 +324,7 @@ jobs:
           if [ "$(echo $test | jq -r '.result')" != "ok" ]; then
             exit 1
           fi
-          echo "::set-output name=slug::$(echo $test | jq -r '.data.slug')"
+          echo "slug=$(echo $test | jq -r '.data.slug')" >> "$GITHUB_OUTPUT"
 
       - name: Uninstall SSH add-on
         run: |

.github/workflows/release-drafter.yml

@@ -33,7 +33,7 @@ jobs:
 
           echo Current version:    $latest
           echo New target version: $datepre.$newpost
-          echo "::set-output name=version::$datepre.$newpost"
+          echo "version=$datepre.$newpost" >> "$GITHUB_OUTPUT"
 
       - name: Run Release Drafter
         uses: release-drafter/release-drafter@v5.25.0