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 #91 (76c5fca) into main (c3528a4) will not change coverage.
The diff coverage is n/a.

❗ Current head 76c5fca differs from pull request most recent head e0cdfc1. Consider uploading reports for the commit e0cdfc1 to get more accurate results

@@           Coverage Diff           @@
##             main      #91   +/-   ##
=======================================
  Coverage   99.35%   99.35%           
=======================================
  Files          17       17           
  Lines         618      618           
=======================================
  Hits          614      614           
  Misses          4        4           

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