Prepare release 21.3.0

[Tobianas]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @Tobianas, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request primarily updates the project version from 21.3.0-SNAPSHOT to 21.4.0-SNAPSHOT across the entire codebase. This is a standard procedure to prepare the project for the next development cycle, rather than an actual release. It also includes updates to various Opendaylight-related dependencies and minor code formatting adjustments.

Highlights

• Project Version Bump: The core project version has been incremented from 21.3.0-SNAPSHOT to 21.4.0-SNAPSHOT in all relevant pom.xml files.
• Opendaylight Dependency Upgrades: Key Opendaylight artifacts such as odlparent, aaa-artifacts, controller-artifacts, infrautils-artifacts, mdsal-artifacts, netconf-artifacts, yangtools-artifacts, and bgpcep-artifacts have been updated to their latest patch versions.
• Build Configuration Refinements: Minor formatting adjustments were made in the tasks within the lighty-rcgnmi-app-docker and lighty-rnc-app-docker Maven configurations.
• Documentation Alignment: README.md files in example projects have been updated to reflect the new 21.4.0-SNAPSHOT version in their usage instructions.
• Annotation Import Refactoring: The @nullable annotation import has been changed from org.checkerframework.checker.nullness.qual.Nullable to org.eclipse.jdt.annotation.Nullable in specific gNMI southbound listener and operation files.

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[gemini-code-assist]

Code Review

This pull request appears to be a standard version bump to prepare for the next development cycle, updating from 21.3.0-SNAPSHOT to 21.4.0-SNAPSHOT and refreshing dependencies. The changes are mostly mechanical and look correct. The pull request title, "Prepare release 21.3.0", is slightly misleading given the version bump to 21.4.0-SNAPSHOT, and might be clearer as "Prepare for 21.4.0 development". I've included a few minor suggestions to improve the formatting of some pom.xml files for better readability.