Upgrade to thiserror 2

[djc]

The minimal version for thiserror (1) was too low, resulting in build failures with -Z minimal-versions. Upgrade to thiserror 2 instead of trying to pinpoint a better minimal version.

[djc]

The markdown-link-check failure appears to be a fluke.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.3%. Comparing base (e8ccb01) to head (aaa9975).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2406   +/-   ##
=====================================
  Coverage   79.3%   79.3%           
=====================================
  Files        123     123           
  Lines      21566   21566           
=====================================
  Hits       17112   17112           
  Misses      4454    4454           

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[cijothomas]

@utpilla I think we discussed in the past about needing thiserror or not. Let us continue with this, and if we ever need to remove it, it can be done without breaking change.