Upgrade JDK version used in CI

Author: mrrfv

.github/workflows/build-companion-unstable.yml

@@ -15,7 +15,7 @@ jobs:
     - uses: actions/setup-java@v3
       with:
         distribution: 'zulu'
-        java-version: '11'
+        java-version: '17'
     - uses: subosito/flutter-action@v2
       with:
         channel: 'stable' # or: 'beta', 'dev' or 'master'

.github/workflows/build-tagged.yml

@@ -16,7 +16,7 @@ jobs:
     - uses: actions/setup-java@v3
       with:
         distribution: 'zulu'
-        java-version: '11'
+        java-version: '17'
     - uses: subosito/flutter-action@v2
       with:
         channel: 'stable' # or: 'beta', 'dev' or 'master'