Update GoogleTest used to 1.16.0

[mcbarton]

Description

Please include a summary of changes, motivation and context for this PR.

Fixes # (issue)

This PR simply updates the GoogleTest we are using to 1.16.0 released 2 months ago. Hopefully the ci passes first time, but this wasn't true of the update to 1.15.2 .

Type of change

Please tick all options which are relevant.

• Bug fix
• New feature
• Requires documentation updates

Testing

Please describe the test(s) that you added and ran to verify your changes.

Checklist

• I have read the contribution guide recently

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.94%. Comparing base (c3384fb) to head (af7e7eb).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #552   +/-   ##
=======================================
  Coverage   75.94%   75.94%           
=======================================
  Files           9        9           
  Lines        3646     3646           
=======================================
  Hits         2769     2769           
  Misses        877      877           

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[Vipul-Cariappa]

LGTM!