Log Message:
google-benchmark: update to 1.5.2.

    Timestamps in output are now rfc3339-formatted #965
    overflow warnings with timers fixed #980
    Python dependencies are now covered by a requirements.txt #994
    JSON output cleaned up when no CPU scaling is present (#1008)
    CartesianProduct added for easier settings of multiple ranges (#1029)
    Python bindings improvements:
        Custom main functions (#993)
        A rename to google_benchmark (#199
        More state methods bound (#1037) with a builder interface (#1040)
    Workflow additions in github include pylint (#1039) and bindings runs (#1041)