benchmarks: Upgrade google benchmark to 1.9.5

[stotko]

A new release of google benchmark is available. Pull in this new version to benefit from the major improvements and cleanups.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.60%. Comparing base (5ab338f) to head (7f3a4d5).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #476   +/-   ##
=======================================
  Coverage   96.60%   96.60%           
=======================================
  Files          33       33           
  Lines        2622     2622           
=======================================
  Hits         2533     2533           
  Misses         89       89           

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