Bump scout_apm from 2.6.6 to 2.6.7

Bumps [scout_apm](https://github.com/scoutapp/scout_apm_ruby) from 2.6.6 to 2.6.7.
- [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/v2.6.6...v2.6.7)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
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