Bump ddtrace from 1.18.0 to 1.21.1

Bumps [ddtrace](https://github.com/DataDog/dd-trace-rb) from 1.18.0 to 1.21.1.
- [Release notes](https://github.com/DataDog/dd-trace-rb/releases)
- [Changelog](https://github.com/DataDog/dd-trace-rb/blob/master/CHANGELOG.md)
- [Commits](DataDog/dd-trace-rb@v1.18.0...v1.21.1)

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

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

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    network_resiliency (0.8.2)
+    network_resiliency (0.0.1)
 
 GEM
   remote: https://rubygems.org/
@@ -87,16 +87,16 @@ GEM
     concurrent-ruby (1.2.2)
     connection_pool (2.4.1)
     crass (1.0.6)
-    datadog-ci (0.5.1)
+    datadog-ci (0.8.3)
       msgpack
     date (3.3.4)
-    ddtrace (1.18.0)
-      datadog-ci (~> 0.5.0)
-      debase-ruby_core_source (= 3.2.3)
-      libdatadog (~> 5.0.0.1.0)
+    ddtrace (1.21.1)
+      datadog-ci (~> 0.8.1)
+      debase-ruby_core_source (= 3.3.1)
+      libdatadog (~> 6.0.0.2.0)
       libddwaf (~> 1.14.0.0.0)
       msgpack
-    debase-ruby_core_source (3.2.3)
+    debase-ruby_core_source (3.3.1)
     diff-lcs (1.5.0)
     docile (1.4.0)
     dogstatsd-ruby (4.8.3)
@@ -135,7 +135,7 @@ GEM
     irb (1.10.1)
       rdoc
       reline (>= 0.3.8)
-    libdatadog (5.0.0.1.0)
+    libdatadog (6.0.0.2.0)
     libddwaf (1.14.0.0.0)
       ffi (~> 1.0)
     loofah (2.22.0)