chore: update jre to 11 for linter (#1278)

java-format requires JRE v11+ to run linter. It still check older code, just jre has to be 11+: google/google-java-format#529

Updating ci.yaml template since it is applicable for all the libraries.
Source-Link: googleapis/synthtool@42a3786
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-java:latest@sha256:14ecf64ec36f67c7bf04e3dc0f68eafcc01df3955121c38862b695e2ae7515d8

Author: gcf-owl-bot[bot]

.github/.OwlBot.lock.yaml

@@ -1,3 +1,3 @@
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-java:latest
-  digest: sha256:204b7af96e6d481f19b0ff377aa379d46bc56dd06e1cc7c523f361dd9cbfeeaa
+  digest: sha256:14ecf64ec36f67c7bf04e3dc0f68eafcc01df3955121c38862b695e2ae7515d8

.github/workflows/ci.yaml

@@ -53,7 +53,7 @@ jobs:
     - uses: actions/setup-java@v2
       with:
         distribution: zulu
-        java-version: 8
+        java-version: 11
     - run: java -version
     - run: .kokoro/build.sh
       env: