ci: enhance os/ruby matrix

[q9f]

Ruby	2.7	3.0	3.1	3.2
Ubuntu 20.4	✅	✅	❌	❌
Ubuntu 22.4	✅	✅	❌	❌
MacOS 11	✅	✅	❌	❌
MacOS 12	✅	✅	❌	❌

[codecov-commenter]

Codecov Report

Merging #71 (427b3e3) into master (36fc4be) will decrease coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #71      +/-   ##
==========================================
- Coverage   99.86%   99.79%   -0.07%     
==========================================
  Files          13       13              
  Lines        1496     1498       +2     
==========================================
+ Hits         1494     1495       +1     
- Misses          2        3       +1     

Impacted Files	Coverage Δ
lib/money-tree.rb	100.00% <100.00%> (ø)
lib/money-tree/key.rb	99.40% <100.00%> (-0.60%)	⬇️
lib/openssl_extensions.rb	100.00% <100.00%> (ø)
spec/money-tree/openssl_extensions_spec.rb	100.00% <100.00%> (ø)

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[q9f]

Ruby	2.7	3.0	3.1	3.2
Ubuntu 20.4	✅	✅	❌	❌
Ubuntu 22.4	✅	✅	❌	❌
MacOS 11	✅	✅	✅	✅
MacOS 12	✅	✅	✅	✅

[q9f]

Ruby	2.7	3.0	3.1	3.2
Ubuntu 20.4	✅	✅	✅	✅
Ubuntu 22.4	✅	✅	❌	❌
MacOS 11	✅	✅	✅	✅
MacOS 12	✅	✅	✅	✅