Update changelog after 1.7.1 release

[awaelchli]

See title

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• [x] Did you make sure your PR does only one thing, instead of bundling different changes together?
• [x] Did you make sure to update the documentation with your changes? (if necessary)
• [x] Did you write any new necessary tests? (not for typos and docs)
• [x] Did you verify new and existing tests pass locally with your changes?
• [x] Did you update the CHANGELOG? (not for typos, docs, test updates, or internal minor changes/refactorings)

PR review

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Did you have fun?

I made sure I had fun coding 🙃

cc @borda @rohitgr7

[awaelchli]

Gatekeeper merge