chore: raise MSRV to 1.87.0

[tessus]

Description

This change raises the MSRV to 1.87.0.

It don't believe this changes anything since most build environments are not a year old and use up-to-date toolchains.

Motivation and Context

See #1477, especially this comment #1477 (comment)

How Has This Been Tested?

compiled manually
cargo tests

Screenshots / Logs (if applicable)

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other - raise MSRV

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly (if applicable).
• I have formatted the code with rustfmt.
  • cargo +nightly fmt --all
• I checked the lints with clippy.
  • cargo clippy --tests --verbose -- -D warnings
• I have added tests to cover my changes.
• All new and existing tests passed.
  • cargo test

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.40%. Comparing base (39cd76e) to head (05fc466).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1479      +/-   ##
==========================================
+ Coverage   47.35%   47.40%   +0.05%     
==========================================
  Files          24       24              
  Lines        2131     2131              
==========================================
+ Hits         1009     1010       +1     
+ Misses       1122     1121       -1     

Flag	Coverage Δ
unit-tests	47.40% <ø> (+0.05%)	⬆️

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