Upgrade: Bump scout_apm from 2.6.4 to 2.6.6
Upgrade: Bump scout_apm from 2.6.4 to 2.6.6

Bumps [scout_apm](https://github.com/scoutapp/scout_apm_ruby) from 2.6.4 to 2.6.6.
- [Release notes](https://github.com/scoutapp/scout_apm_ruby/releases)
- [Changelog](https://github.com/scoutapp/scout_apm_ruby/blob/master/CHANGELOG.markdown)
- [Commits](https://github.com/scoutapp/scout_apm_ruby/compare/v2.6.4...v2.6.6)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
scott/helpy__helpdesk_knowledgebase,helpyio/helpy,scott/helpy__helpdesk_knowledgebase,helpyio/helpy,helpyio/helpy,helpyio/helpy,scott/helpy__helpdesk_knowledgebase