Bump ddtrace from 0.53.0 to 0.54.1

Bumps [ddtrace](https://github.com/DataDog/dd-trace-rb) from 0.53.0 to 0.54.1.
- [Release notes](https://github.com/DataDog/dd-trace-rb/releases)
- [Changelog](https://github.com/DataDog/dd-trace-rb/blob/master/CHANGELOG.md)
- [Commits](https://github.com/DataDog/dd-trace-rb/compare/v0.53.0...v0.54.1)

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

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

Gemfile.lock

@@ -220,9 +220,10 @@ GEM
       activerecord (>= 5.a)
       database_cleaner-core (~> 2.0.0)
     database_cleaner-core (2.0.1)
-    ddtrace (0.53.0)
-      ffi (~> 1.0)
+    ddtrace (0.54.1)
+      debase-ruby_core_source (= 0.10.12)
       msgpack
+    debase-ruby_core_source (0.10.12)
     debugger-linecache (1.2.0)
     devise (4.8.0)
       bcrypt (~> 3.0)
@@ -269,7 +270,7 @@ GEM
       concurrent-ruby (~> 1.1)
       websocket-driver (>= 0.6, < 0.8)
     ffaker (2.20.0)
-    ffi (1.15.4)
+    ffi (1.15.5)
     flipper (0.20.4)
     flipper-active_record (0.20.4)
       activerecord (>= 5.0, < 7)