Bump braveVersion from 6.0.2 to 6.0.3 (#3172)

Bumps `braveVersion` from 6.0.2 to 6.0.3.

Updates `io.zipkin.brave:brave-instrumentation-http` from 6.0.2 to 6.0.3

Updates `io.zipkin.brave:brave-instrumentation-http-tests` from 6.0.2 to 6.0.3

Updates `io.zipkin.brave:brave` from 6.0.2 to 6.0.3
- [Release notes](https://github.com/openzipkin/brave/releases)
- [Changelog](https://github.com/openzipkin/brave/blob/master/RELEASE.md)
- [Commits](openzipkin/brave@6.0.2...6.0.3)

---
updated-dependencies:
- dependency-name: io.zipkin.brave:brave-instrumentation-http
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: io.zipkin.brave:brave-instrumentation-http-tests
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: io.zipkin.brave:brave
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

build.gradle

@@ -98,7 +98,7 @@ ext {
 		println "Context Propagation version defined from command line: ${forceContextPropagationVersion}"
 	}
 
-	braveVersion = '6.0.2'
+	braveVersion = '6.0.3'
 	zipkinSenderVersion = '3.4.0'
 
 	jsr305Version = '3.0.2'