Bump appsignal from 3.5.5 to 3.5.6

Bumps [appsignal](https://github.com/appsignal/appsignal-ruby) from 3.5.5 to 3.5.6.
- [Changelog](https://github.com/appsignal/appsignal-ruby/blob/main/CHANGELOG.md)
- [Commits](appsignal/appsignal-ruby@v3.5.5...v3.5.6)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -68,7 +68,7 @@ GEM
       tzinfo (~> 2.0)
     addressable (2.8.6)
       public_suffix (>= 2.0.2, < 6.0)
-    appsignal (3.5.5)
+    appsignal (3.5.6)
       rack
     ast (2.4.2)
     bcrypt (3.1.20)