Upgrade alchemy_cms to version 5.1.1

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Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ alchemy_cms (>= 4.2.0.rc1, < 5 → >= 4.2.0.rc1, <= 5.1.1) · Repo · Changelog

Commits

See the full diff on Github. The new version differs by 3 commits:

• v5.1.1
• Merge pull request #1998 from tvdeyen/fix-element-copy-5.1
• Fix copy element feature

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