Enable dependabot and update CI actions

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly

.github/workflows/full-check.yml

@@ -23,17 +23,17 @@ jobs:
         java-version: [ '8', '11', '17' ]
     steps:
       - name: Checkout GWT itself into one directory
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           path: 'gwt'
       - name: Checkout GWT tools into a sibling directory
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           repository: 'gwtproject/tools'
           path: 'tools'
       - name: Set up JDK ${{ matrix.java-version }}
         # GWT presently requires Java8 to build just the SDK and some tests, or 11 to build everything, but can run on newer Java versions
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
           java-version: ${{ matrix.java-version }}
           distribution: 'temurin'
@@ -57,32 +57,32 @@ jobs:
             -Dtest.emma.htmlunit.disable=true
 
       - name: Report test results
-        uses: mikepenz/action-junit-report@v3.1.0
+        uses: mikepenz/action-junit-report@v4.0.3
         if: always()
         with:
           report_paths: 'gwt/build/out/**/test/**/reports/TEST-*.xml'
       - name: Upload checkstyle xml for manual review in its own artifact
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         if: always()
         with:
           name: checkstyle-reports-java${{ matrix.java-version }}
           path: 'gwt/build/out/**/checkstyle*.xml'
       - name: Upload test xml files for manual review in its own artifact
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         if: always()
         with:
           name: junit-reports-java${{ matrix.java-version }}
           path: 'gwt/build/out/**/test/**/reports/TEST-*.xml'
 
       - name: On success, upload the release zip
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: gwt-java${{ matrix.java-version }}
           path: 'gwt/build/dist/gwt-*.zip'
 
       - name: Set up sonatype credentials
         # Using the same java version as above, set up a settings.xml file
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         if: ${{ github.event_name == 'schedule' && github.repository_owner == 'gwtproject' && matrix.java-version == '17' }}
         with:
           java-version: ${{ matrix.java-version }}

.github/workflows/quick-check.yml

@@ -11,19 +11,19 @@ jobs:
         java-version: ['8', '11', '17']
     steps:
       - name: Checkout GWT itself into one directory
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           path: 'gwt'
           # we need depth=2 to see which style violations overlap with the current changes
           fetch-depth: 2
       - name: Checkout GWT tools into a sibling directory
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           repository: 'gwtproject/tools'
           path: 'tools'
       - name: Set up JDK ${{ matrix.java-version }}
         # GWT presently requires Java8 to build just the SDK and some tests, or 11+ to build everything, and can run on newer Java versions
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
           java-version: ${{ matrix.java-version }}
           distribution: 'temurin'
@@ -57,7 +57,7 @@ jobs:
             reviewdog -f=checkstyle -filter-mode=diff_context -reporter=github-pr-review -level=info < $f
           done
       - name: Upload checkstyle xml for manual review
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         if: ${{ matrix.java-version == '17' }}
         with:
           name: checkstyle-reports-java${{ matrix.java-version }}