Remove Java 11 build

This repository is now only about the memory segment implementation, so it makes no sense to test on Java 11 where memory segments are not available.

.github/workflows/ci-workflow.yml

@@ -64,32 +64,3 @@ jobs:
       # Make room for the docker layer caching to package up layers
       - name: Cleanup
         run: rm -fr *
-  java11:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - name: Set up Java 11
-        uses: actions/setup-java@v2
-        with:
-          distribution: 'adopt' # See 'Supported distributions' for available options
-          java-version: '11'
-      - uses: actions/cache@v2
-        with:
-          path: ~/.m2/repository
-          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
-          restore-keys: |
-            ${{ runner.os }}-maven-
-      - name: Maven build
-        run: mvn verify -B -C -T1C -fae
-      - name: Upload Java 11 Test Results
-        if: always()
-        uses: actions/upload-artifact@v2
-        with:
-          name: test-results-java11
-          path: '**/target/surefire-reports/TEST-*.xml'
-      - name: Upload build artefacts
-        uses: actions/upload-artifact@v2
-        if: ${{ failure() }}
-        with:
-          name: artifacts
-          path: target/