chore(hypertrace/java-grpc-utils): Upgrade 0.13.15 (#71)

* chore(hypertrace/java-grpc-utils): Upgrade refs/tags/0.13.15

* Update gradle/libs.versions.toml

---------

Co-authored-by: hypertrace-ci-app[bot] <145367492+hypertrace-ci-app[bot]@users.noreply.github.com>
Co-authored-by: Aaron Steinfeld <[email protected]>

Author: hypertrace-ci-app[bot]

gradle/libs.versions.toml

@@ -2,7 +2,7 @@
 protoc = "3.25.8"
 grpc = "1.68.3"
 hypertrace-framework = "0.1.89"
-hypertrace-grpcutils = "0.13.14"
+hypertrace-grpcutils = "0.13.15"
 hypertrace-kafka = "0.6.0"
 hypertrace-bom = "+"
 hypertrace-attributeservice = "0.14.35"