[Merged by Bors] - chore: adaptations for lean4#5542

[kmill]

In lean4#5542 we are deprecating inductive ... :=, structure ... :=, and class ... := for their ... where counterparts.

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[github-actions]

PR summary 03bf4f6e67

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

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Declarations diff

-+-+-+-+-+ Hom
--++ IsCompatibleWithShift
------++++++--++ Equiv

You can run this locally as follows

## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>

The doc-module for script/declarations_diff.sh contains some details about this script.

[grunweg]

I checked the entire diff (phew), and this PR does what is says, and aligns mathlib with an upcoming core change. Thanks!
maintainer merge

[github-actions]

🚀 Pull request has been placed on the maintainer queue by grunweg.

[jcommelin]

Thanks 🎉

If CI passes, please remove the label awaiting-CI and merge this yourself, by adding a comment bors r+.

bors d+

[mathlib-bors]

✌️ kmill can now approve this pull request. To approve and merge a pull request, simply reply with bors r+. More detailed instructions are available here.

[kmill]

bors r+

[mathlib-bors]

Pull request successfully merged into master.

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