Bump io.grpc:grpc-bom from 1.77.0 to 1.78.0 (#24611)

Bumps [io.grpc:grpc-bom](https://github.com/grpc/grpc-java) from 1.77.0 to 1.78.0.
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.77.0...v1.78.0)

---
updated-dependencies:
- dependency-name: io.grpc:grpc-bom
  dependency-version: 1.78.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pom.xml

@@ -134,7 +134,7 @@
         <gelfclient.version>1.5.1</gelfclient.version>
         <geoip2.version>4.4.0</geoip2.version>
         <grok.version>0.1.9-graylog-3</grok.version>
-        <grpc.version>1.77.0</grpc.version>
+        <grpc.version>1.78.0</grpc.version>
         <guava-retrying.version>2.0.0</guava-retrying.version>
         <guava.version>33.5.0-jre</guava.version>
         <guice.version>7.0.0</guice.version>