bump min rust version

[martintc]

I'm submitting a

• bug fix
• feature
• documentation addition
• chore

What is the current behaviour?

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem

What is the expected behavior?

What is the motivation / use case for changing the behavior?

Please tell us about your environment:

Version (comtrya --version):
Operating system:

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.43%. Comparing base (b574682) to head (5f5b5d6).
Report is 11 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #413      +/-   ##
==========================================
- Coverage   28.59%   28.43%   -0.17%     
==========================================
  Files          85       85              
  Lines        2301     2307       +6     
==========================================
- Hits          658      656       -2     
- Misses       1643     1651       +8     

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