Fix MSRV CI - libloading

[justsmth]

Description of changes:

Fix failing MSRV CI job.

• Latest version of libloading bumps MSRV to 1.71.0.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.36%. Comparing base (c358484) to head (cc88d32).
⚠️ Report is 263 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #888      +/-   ##
==========================================
- Coverage   95.80%   92.36%   -3.44%     
==========================================
  Files          61       73      +12     
  Lines        8143     9634    +1491     
  Branches        0     9634    +9634     
==========================================
+ Hits         7801     8898    +1097     
- Misses        342      450     +108     
- Partials        0      286     +286     

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