Bump byte-buddy-agent from 1.11.15 to 1.11.19

Bumps [byte-buddy-agent](https://github.com/raphw/byte-buddy) from 1.11.15 to 1.11.19.
- [Release notes](https://github.com/raphw/byte-buddy/releases)
- [Changelog](https://github.com/raphw/byte-buddy/blob/master/release-notes.md)
- [Commits](raphw/byte-buddy@byte-buddy-1.11.15...byte-buddy-1.11.19)

---
updated-dependencies:
- dependency-name: net.bytebuddy:byte-buddy-agent
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

agent/build.gradle

@@ -56,7 +56,7 @@ dependencies {
     annotationProcessor 'com.google.auto.service:auto-service:1.0-rc7'
 
     implementation 'net.bytebuddy:byte-buddy:1.11.19'
-    implementation 'net.bytebuddy:byte-buddy-agent:1.11.15'
+    implementation 'net.bytebuddy:byte-buddy-agent:1.11.19'
 
     compileOnly 'io.projectreactor:reactor-core:3.2.5.RELEASE'
     compileOnly 'io.reactivex.rxjava2:rxjava:2.2.18'