Update GoogleTest to latest version

[mjcarroll]

Import latest version of GoogleTest from upstream and adjust build accordingly.

Tracking issue: gazebosim/gz-sim#1537

Signed-off-by: Michael Carroll michael@openrobotics.org

[codecov]

Codecov Report

Merging #269 (f2bf0e1) into main (a877872) will not change coverage.
The diff coverage is n/a.

❗ Current head f2bf0e1 differs from pull request most recent head c28e47e. Consider uploading reports for the commit c28e47e to get more accurate results

@@           Coverage Diff           @@
##             main     #269   +/-   ##
=======================================
  Coverage   73.69%   73.69%           
=======================================
  Files          20       20           
  Lines        2863     2863           
=======================================
  Hits         2110     2110           
  Misses        753      753           

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