update: go 1.18 -> 1.22

[mazrean]

The minimum version of Go to support was previously set at 1.18, but due to a problem updating the library (ref #171), we are raising it to 1.22.
Until now, we had kept 1.18, the oldest version that works, in order to be able to use even the oldest Go version as much as possible.
Since the support term of Go itself has already expired, we think it is OK to raise it up to 1.22.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 31.87%. Comparing base (5bf1050) to head (dea093e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #175      +/-   ##
==========================================
- Coverage   32.57%   31.87%   -0.71%     
==========================================
  Files          23       26       +3     
  Lines        5228     5343     +115     
==========================================
  Hits         1703     1703              
- Misses       3344     3459     +115     
  Partials      181      181              

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