Transition from Java 8 to 11

With the current version of `rdf-toolkit-action`, this is expected to
cause a CI failure due to an `rdf-toolkit.jar` incompatibility.  A
release coming soon for `rdf-toolkit-action` will update the `.jar` file
used.

Signed-off-by: Alex Nelson <alexander.nelson@nist.gov>
(cherry picked from commit 282468f)

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
     - uses: actions/setup-java@v3
       with:
         distribution: 'temurin'
-        java-version: '8'
+        java-version: '11'
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with: