Upgrade to Rust 1.85

[akoshelev]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.09%. Comparing base (cb7a54e) to head (136f655).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1526   +/-   ##
=======================================
  Coverage   92.08%   92.09%           
=======================================
  Files         220      220           
  Lines       38237    38229    -8     
=======================================
- Hits        35212    35206    -6     
+ Misses       3025     3023    -2     

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[martinthomson]

Take a look at the miri failures. There are new lints around #[must_use] in nightly builds that you might want to fix up.