Bump openjdk version to 11

This commit resolves an unusual bug where pytest
fails to collect the results of the jep test, resulting
in failing CI jobs. I was able to reproduce this locally,
sometimes, with openjdk=8. There must be a race condition involved
with the bug as it doesn't always fail. The crash is a seg fault.

.github/workflows/build.yml

@@ -36,7 +36,7 @@ jobs:
 
     - uses: actions/setup-java@v3
       with:
-        java-version: '8'
+        java-version: '11'
         distribution: 'zulu'
         cache: 'maven'