Bump appsignal from 3.7.2 to 3.7.3

Bumps [appsignal](https://github.com/appsignal/appsignal-ruby) from 3.7.2 to 3.7.3.
- [Changelog](https://github.com/appsignal/appsignal-ruby/blob/main/CHANGELOG.md)
- [Commits](appsignal/appsignal-ruby@v3.7.2...v3.7.3)

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

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

Gemfile.lock

@@ -77,7 +77,7 @@ GEM
       tzinfo (~> 2.0)
     addressable (2.8.6)
       public_suffix (>= 2.0.2, < 6.0)
-    appsignal (3.7.2)
+    appsignal (3.7.3)
       rack
     autoprefixer-rails (10.4.16.0)
       execjs (~> 2)