fix: check for body type before parsePush execution

[jescalada]

Fixes #1509.

[netlify]

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[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.18%. Comparing base (6981427) to head (aa7c42c).

Files with missing lines	Patch %	Lines
src/proxy/processors/push-action/parsePush.ts	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1511      +/-   ##
==========================================
- Coverage   90.21%   90.18%   -0.04%     
==========================================
  Files          69       69              
  Lines        5511     5514       +3     
  Branches      944      946       +2     
==========================================
+ Hits         4972     4973       +1     
- Misses        521      523       +2     
  Partials       18       18              

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[jescalada]

This bit had to be removed in order to fix the "unpinned dependency" alert https://github.com/finos/git-proxy/security/code-scanning/113. I think this shouldn't cause issues since the published package wouldn't include the peer dep (finos/git-proxy) - unless I'm missing something 🤔

Pinging @coopernetes just in case!