Bump musl-dev to 1.2.3-r1 in Dockerfile

[bachya]

Describe what the PR does:

SSIA

Does this fix a specific issue?

N/A

Checklist:

• Confirm that one or more new tests are written for the new functionality.
• Run tests and ensure everything passes (with 100% test coverage).
• Update README.md with any new documentation.
• Add yourself to AUTHORS.md.

[codecov]

Codecov Report

Merging #377 (fd4bc6a) into dev (ef16b67) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               dev      #377   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           29        29           
  Lines         1536      1536           
=========================================
  Hits          1536      1536           

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