GHA: update actions/cache + actions/checkout to v3

[striezel]

Updates the actions/checkout and actions/cache actions used in the GitHub Actions workflow to their newest version.

Changes in actions/cache:

3.0.0

• Updated minimum runner version support from node 12 -> node 16

3.0.1

• Added support for caching from GHES 3.5.
• Fixed download issue for files > 2GB during restore.

Changes in actions/checkout:

v3.0.2

• Add input set-safe-directory

v3.0.1

• Fixed an issue where checkout failed to run in container jobs due to the new git setting safe.directory
• Bumped various npm package versions

v3.0.0

• Update to node 16

As far as I can tell this should all be backwards compatible, so I do not expect any breakage.

[codecov]

Codecov Report

Merging #160 (12e5864) into master (5222655) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #160   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           16        16           
  Branches         7         7           
=========================================
  Hits            16        16           

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