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 #20 (a7d3a54) into main (31a5755) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main      #20   +/-   ##
=========================================
  Coverage     89.68%   89.68%           
  Complexity      105      105           
=========================================
  Files            14       14           
  Lines           378      378           
  Branches         16       16           
=========================================
  Hits            339      339           
  Misses           32       32           
  Partials          7        7           

Flag	Coverage Δ	Complexity Δ
integration	89.68% <ø> (ø)	0.00 <ø> (ø)
unit	89.42% <ø> (ø)	0.00 <ø> (ø)

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[github-actions]

Unit Test Results

  9 files  ±0    9 suites  ±0   12s ⏱️ +3s
29 tests ±0  29 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 58c6f90. ± Comparison against base commit 31a5755.