change: Only test on new LTS and above

[kshyatt-aws]

Issue #, if available: N/A

Description of changes: Julia 1.10 is the new LTS, so we can be frugal and drop support for older versions in CI.

Testing done: N/A

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.98%. Comparing base (2efe7c3) to head (4219ef8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #105      +/-   ##
==========================================
- Coverage   88.94%   87.98%   -0.97%     
==========================================
  Files          36       36              
  Lines        3981     3979       -2     
==========================================
- Hits         3541     3501      -40     
- Misses        440      478      +38     

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