docs: bumpversion to v2.1.2

[Copilot]

Description

Bumps the plugin version to v2.1.2 to align with the latest WordPress release. Updates version metadata and lists the accumulated changes since v2.1.1 in the changelog.

Changes

• Version Bump:
  • openedx-commerce.php: Bumps plugin header Version and OPENEDX_COMMERCE_VERSION constant.
  • README.txt: Bumps Stable tag to 2.1.2.
• Changelog Update:
  • CHANGELOG.md: Adds release section for v2.1.2 detailing bug fixes and maintenance commits.

// openedx-commerce.php
- Version:           2.1.1
+ Version:           2.1.2
...
- define( 'OPENEDX_COMMERCE_VERSION', '2.1.1' );
+ define( 'OPENEDX_COMMERCE_VERSION', '2.1.2' );

Testing instructions

1. Confirm that openedx-commerce.php defines version constants and headers as 2.1.2.
2. Confirm that README.txt specifies Stable tag: 2.1.2.
3. Inspect CHANGELOG.md to verify the list of features, bug fixes, and maintenance items for the new release.

Additional information

This release officially packs the WordPress compatibility target of 7.0 (previously updated in the codebase).

Checklist for Merge

• Tested in a remote environment
• Updated documentation
• Rebased master/main
• Squashed commits

[github-actions]

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✅ Status: Passed

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[felipemontoya]

LGTM. I think is good to merge so that we can trigger a new release with all recent maintenance fixes