Resolve "Bump google test version in hammer"

Closes #3350 (closed).

• 0103b20c Updated gtest version to 1.14

• d1d3e20b install googletest packages in hammer

• d53b242a put bison and flex as free packages in hammer

• 442dd937 clean up some old revision logic in hammer

• da892807 upgrade pip in hammer for rhel

  Fixes this on RHEL 8: You are using pip version 9.0.3, however version 24.0 is available.

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• https://jenkins.aws.isc.org/job/kea-manual/job/hammer-and-configure/69/
• https://jenkins.aws.isc.org/job/kea-manual/job/pkg/388/
• https://jenkins.aws.isc.org/job/kea-manual/job/ut-extended/302/