Bump io.grpc:grpc-protobuf from 1.77.0 to 1.78.0

Bumps [io.grpc:grpc-protobuf](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-protobuf
  dependency-version: 1.78.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -13,7 +13,7 @@ buf = { module = "build.buf:buf", version.ref = "buf" }
 cel = { module = "dev.cel:cel", version.ref = "cel" }
 errorprone-annotations = { module = "com.google.errorprone:error_prone_annotations", version.ref = "error-prone" }
 errorprone-core = { module = "com.google.errorprone:error_prone_core", version.ref = "error-prone" }
-grpc-protobuf = { module = "io.grpc:grpc-protobuf", version = "1.77.0" }
+grpc-protobuf = { module = "io.grpc:grpc-protobuf", version = "1.78.0" }
 jspecify = { module ="org.jspecify:jspecify", version = "1.0.0" }
 junit-bom = { module = "org.junit:junit-bom", version.ref = "junit" }
 maven-plugin = { module = "com.vanniktech:gradle-maven-publish-plugin", version.ref = "maven-publish" }