Bump maturin to 1.12

[schnellerhase]

Upstream fix for #1493 should be released with this version.

[coveralls]

Pull Request Test Coverage Report for Build 22041978605

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 21.212%

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Totals
Change from base Build 21828754586:	0.0%
Covered Lines:	539
Relevant Lines:	2541

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💛 - Coveralls