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 #69 (b8edefb) into main (319763c) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main      #69   +/-   ##
=========================================
  Coverage     56.26%   56.26%           
  Complexity       41       41           
=========================================
  Files            20       20           
  Lines           375      375           
  Branches         18       18           
=========================================
  Hits            211      211           
  Misses          160      160           
  Partials          4        4           

Flag	Coverage Δ	Complexity Δ
unit	56.26% <ø> (ø)	0.00 <ø> (ø)

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[github-actions]

Unit Test Results

  7 files  ±0    7 suites  ±0   9s ⏱️ ±0s
15 tests ±0  15 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit a05b05d. ± Comparison against base commit 319763c.