build(deps): bump scout_apm from 5.6.2 to 5.6.4

Bumps [scout_apm](https://github.com/scoutapp/scout_apm_ruby) from 5.6.2 to 5.6.4.
- [Changelog](https://github.com/scoutapp/scout_apm_ruby/blob/master/CHANGELOG.markdown)
- [Commits](scoutapp/scout_apm_ruby@v5.6.2...v5.6.4)

---
updated-dependencies:
- dependency-name: scout_apm
  dependency-version: 5.6.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -538,7 +538,7 @@ GEM
     sanitize (7.0.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.16.8)
-    scout_apm (5.6.2)
+    scout_apm (5.6.4)
       parser
     securerandom (0.4.1)
     selenium-webdriver (4.31.0)