Update CHANGES.md after release cut

[Abacn]

Please add a meaningful description for your change here

---

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• Mention the appropriate issue in your description (for example: addresses #123), if applicable. This will automatically add a link to the pull request in the issue. If you would like the issue to automatically close on merging the pull request, comment fixes #<ISSUE NUMBER> instead.
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[gemini-code-assist]

Summary of Changes

Hello, 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 performs the necessary maintenance on the project's changelog to reflect the upcoming 2.75.0 release. It involves structuring the documentation for new features, breaking changes, and bugfixes, while ensuring the previous release notes are correctly archived.

Highlights

• CHANGES.md Update: Updated the CHANGES.md file to prepare for the 2.75.0 release by adding placeholders and cleaning up legacy entries.

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[gemini-code-assist]

Code Review

This pull request updates CHANGES.md to prepare for the 2.75.0 release cycle by bumping the unreleased version and moving 2.74.0 entries to a dated section. It also adds a standardized template for future change logs. A minor grammatical correction was suggested for a template comment to improve clarity.

[gemini-code-assist]

There is a minor grammatical error in the template comment. It should be 'make sure to also update' for better clarity.

Suggested change

	[comment]: # ( When updating known issues after release, make sure also update website blog in website/www/site/content/blog.)
	[comment]: # ( When updating known issues after release, make sure to also update website blog in website/www/site/content/blog.)

[github-actions]

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R: @shunping added as fallback since no labels match configuration

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