Update version to 2.12.0 for the main release

[pranavrth]

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[Copilot]

Pull Request Overview

This PR updates the project version from 2.12.0rc2 to the final 2.12.0 release across multiple configuration files and test setups.

• Remove release candidate designation from version strings
• Enable 2.12.0 version in soak test configurations
• Update version references in build and deployment files

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/soak/setup_all_versions.py	Uncommented 2.12.0 version entries in test version arrays
src/confluent_kafka/src/confluent_kafka.h	Updated version string from rc2 to final release
pyproject.toml	Updated project version from rc2 to final release
examples/docker/Dockerfile.alpine	Updated librdkafka version environment variable
.semaphore/semaphore.yml	Updated librdkafka version in CI configuration

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[sonarqube-confluent]

Analysis Details

0 Issues

• 0 Bugs
• 0 Vulnerabilities
• 0 Code Smells

Coverage and Duplications

• No coverage information (66.90% Estimated after merge)
• No duplication information (4.90% Estimated after merge)

Project ID: confluent-kafka-python

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