(MINOR) Bump MSRV to 1.61

[scouten-adobe]

[codecov-commenter]

Codecov Report

Merging #142 (0a7d43d) into main (b6d075d) will increase coverage by 0.00%. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #142   +/-   ##
=======================================
  Coverage   78.26%   78.27%           
=======================================
  Files          67       67           
  Lines       14684    14684           
=======================================
+ Hits        11493    11494    +1     
+ Misses       3191     3190    -1     

Impacted Files	Coverage Δ
make_test_images/src/make_test_images.rs	68.20% <0.00%> (+0.41%)	:arrow_up:

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