fix: uses checksum action from github-actions repository

[JBAhire]

Description

removes reference to old actions repository and updates it to use custom action from github-actions repository.

Checklist:

• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been merged and published in downstream modules

Documentation

https://github.com/hypertrace/github-actions

[codecov]

Codecov Report

Merging #79 (1b1870c) into main (fa3a546) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main      #79   +/-   ##
=========================================
  Coverage     75.60%   75.60%           
  Complexity     1056     1056           
=========================================
  Files           105      105           
  Lines          4849     4849           
  Branches        415      415           
=========================================
  Hits           3666     3666           
  Misses         1000     1000           
  Partials        183      183           

Flag	Coverage Δ	Complexity Δ
unit	75.60% <ø> (ø)	0.00 <ø> (ø)

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[github-actions]

Unit Test Results

  54 files  ±0    54 suites  ±0   10s ⏱️ ±0s
311 tests ±0  311 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 80f8cd5. ± Comparison against base commit fa3a546.