Gradle 9: Phase out Java 11 for testcontainers/java

  Gradle requires JVM 17 or later to run.
  Your build is currently configured to use JVM 11.

Author: amotl

.github/workflows/testing-testcontainers-java.yml

@@ -38,7 +38,6 @@ jobs:
       matrix:
         os: [ 'ubuntu-latest' ]
         java-version: [
-          '11',
           '17',
           '21',
           '24',