Bump the trace-java-client-gradle-deps group

Bumps the trace-java-client-gradle-deps group in /trace-java-client with 1 update: [io.zipkin.zipkin2:zipkin](https://github.com/openzipkin/zipkin).


Updates `io.zipkin.zipkin2:zipkin` from 2.25.2 to 2.26.0
- [Release notes](https://github.com/openzipkin/zipkin/releases)
- [Changelog](https://github.com/openzipkin/zipkin/blob/master/RELEASE.md)
- [Commits](openzipkin/zipkin@2.25.2...2.26.0)

---
updated-dependencies:
- dependency-name: io.zipkin.zipkin2:zipkin
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: trace-java-client-gradle-deps
...

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

trace-java-client/build.gradle

@@ -21,7 +21,7 @@ dependencies {
     implementation group: 'org.apache.commons', name: 'commons-lang3', version: '3.14.0'
     implementation group: 'io.jaegertracing', name: 'jaeger-core', version: '1.8.1'
     implementation group: 'io.jaegertracing', name: 'jaeger-thrift', version: '1.8.1'
-    implementation group: 'io.zipkin.zipkin2', name: 'zipkin', version: '2.25.2'
+    implementation group: 'io.zipkin.zipkin2', name: 'zipkin', version: '2.26.0'
     implementation group: 'io.zipkin.reporter2', name: 'zipkin-sender-okhttp3', version: '2.17.1'
     implementation group: 'io.zipkin.brave', name: 'brave', version: '5.17.0'