Log Message:
google-benchmark: updated to 1.8.1

v1.8.1
Disable debug-only test in release builds to avoid expected failures.
Fix code triggering -Wsign-conversion
Update Python version to PY3, as indicated by the actual source file.
Fixed a typo in docs
Fix pass rvalue to DoNotOptimize
Fix a typo in regex choice
remove old-style (C-style) casts
Add support for bzlmod (excluding Python bindings)
Add a CI test for the new bzlmod integration
Suppress intentional potential memory leak as detected by clang static analysis