Replace mixed line ending commit hook with .gitattributes.

[HexDecimal]

This commit hook was causing me some issues. Since I use autoclrf I don't upload mixed line endings on commits even without a hook preventing it, but that's a local setting.

A .gitattributes file enforces line endings regardless of local settings. This does what this commit hook was intending to do but works better across platforms.

[codecov[bot]]

Codecov Report

Base: 68.76% // Head: 68.76% // No change to project coverage :thumbsup:

Coverage data is based on head (c69200e) compared to base (c85a333). Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           publicapi     #474   +/-   ##
==========================================
  Coverage      68.76%   68.76%           
==========================================
  Files             11       11           
  Lines            986      986           
==========================================
  Hits             678      678           
  Misses           308      308           

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