Migrate to Python 3.14 and use confluent-docker-utils branch

[Abhishek Krishna (abh1sh5k)]

Summary

This PR migrates the base image from Python 3.9 to Python 3.14 and changes confluent-docker-utils to use the replace-docker-compose-with-sdk branch instead of a tagged release.

Changes

1. Python 3.9 → 3.14 Migration

• Property names updated:
  • ubi8-minimal.python39.version → ubi8-minimal.python314.version
  • ubi8-minimal.python39-pip.version → ubi8-minimal.python314-pip.version
• Dockerfile updated (base/Dockerfile.ubi8):
  • Package names: python39 → python3.14
  • Package names: python39-pip → python3.14-pip
• POM references updated in base/pom.xml (both spotify and fabric8 plugins)

2. confluent-docker-utils Branch Reference

• Changed git-repo.confluent-docker-utils.tag from v0.0.162 to replace-docker-compose-with-sdk
• Updated base/requirements.txt to reference the branch instead of the tag

Files Modified

• pom.xml - Updated property definitions
• base/pom.xml - Updated build arguments
• base/Dockerfile.ubi8 - Updated Python package names
• base/requirements.txt - Updated confluent-docker-utils reference

Testing Notes

⚠️ Important: Please verify that Python 3.14 packages are available in the UBI8 repositories before merging. The version strings may need to be updated based on actual package availability.

Related

Based on 7.9.x branch.