Draft: Bump MSRV to 1.75.0

Mikkel Kjeldsenrequested to merge
bump-msrv into master

Note that since fc904e0 (Bump MSRV to 1.63.0, 2025-08-02), openSUSE Leap is back in the game with 15.6 and 16. Oh, well.

  • Debian "trixie" (stable)
  • Ubuntu 24.04

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