Increment version for 2.11.3

[github-actions]

Description

A new version of OpenSearch was released, to prepare for the next release new version numbers need to be updated in all active branches of development.

Exit Criteria

Review and merged the following pull requests

• [AUTO] Increment version to 2.11.3. #155
• [AUTO] [2.x] Add bwc version 2.11.3. #156
• [AUTO] [main] Add bwc version 2.11.3. #157

Additional Context

See project wide guidance on branching and versions [link].