Proof of concept on higher build Java version

[alzimmermsft]

Description

Proof of concept for having a higher JVM build requirement than bytecode requirement. This PR increases the build requirement to Java 11 to enable support for newer version of Checkstyle and Spotless which now require a Java 11 runtime. This does NOT change baseline support requirements; those continue to be Java 8. If running build with Java 8 Checkstyle and Spotless won't run but will run in CI, preventing issues if testing locally with Java 8 and preventing code from being checked in with invalid Checkstyle or Spotless linting.

This only affects libraries using azure-client-sdk-parent as the parent POM, those using azure-data-sdk-parent will continue running linting when running on Java 8 as those libraries have a lower baseline support version (and are generally not in active development or are end of life).

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

[azure-sdk]

API change check

API changes are not detected in this pull request.