build(deps): bump scout_apm from 5.3.8 to 5.4.0 (#6064)

Bumps [scout_apm](https://github.com/scoutapp/scout_apm_ruby) from 5.3.8 to 5.4.0.
- [Changelog](https://github.com/scoutapp/scout_apm_ruby/blob/master/CHANGELOG.markdown)
- [Commits](scoutapp/scout_apm_ruby@v5.3.8...v5.4.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -342,7 +342,7 @@ GEM
       parallel
     paranoia (3.0.0)
       activerecord (>= 6, < 8.1)
-    parser (3.3.4.2)
+    parser (3.3.5.0)
       ast (~> 2.4.1)
       racc
     pdf-forms (1.5.1)
@@ -487,7 +487,7 @@ GEM
     sanitize (6.1.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
-    scout_apm (5.3.8)
+    scout_apm (5.4.0)
       parser
     securerandom (0.3.1)
       base64 (~> 0.2)