Bump net.bytebuddy:byte-buddy-agent from 1.14.18 to 1.15.3

Bumps [net.bytebuddy:byte-buddy-agent](https://github.com/raphw/byte-buddy) from 1.14.18 to 1.15.3.
- [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-1.14.18...byte-buddy-1.15.3)

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

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

agent/build.gradle

@@ -63,7 +63,7 @@ dependencies {
     annotationProcessor 'com.google.auto.service:auto-service:1.1.1'
 
     implementation 'net.bytebuddy:byte-buddy:1.14.18'    
-    implementation 'net.bytebuddy:byte-buddy-agent:1.14.18'
+    implementation 'net.bytebuddy:byte-buddy-agent:1.15.3'
 
     compileOnly 'io.projectreactor:reactor-core:3.2.5.RELEASE'
     compileOnly 'io.reactivex.rxjava2:rxjava:2.2.18'