Bump Java bytecode compatibility version to Java11

Author: Abacn

gradle.properties

@@ -33,7 +33,7 @@ signing.gnupg.useLegacyGpg=true
 version=2.74.0-SNAPSHOT
 sdk_version=2.74.0.dev
 
-javaVersion=1.8
+javaVersion=11
 
 docker_image_default_repo_root=apache
 docker_image_default_repo_prefix=beam_

website/www/site/content/en/documentation/sdks/java.md

@@ -78,6 +78,6 @@ Apache Beam lets you combine transforms written in any supported SDK language an
 </tr>
 <tr>
   <td>8</td>
-  <td>2.x</td>
+  <td>&le; 2.74.0</td>
 </tr>
 </table>