build(deps): bump grpc in /hiero-dependency-versions

Bumps `grpc` from 1.64.0 to 1.69.0.

Updates `io.grpc:grpc-netty` from 1.64.0 to 1.69.0
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.64.0...v1.69.0)

Updates `io.grpc:grpc-protobuf` from 1.64.0 to 1.69.0
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.64.0...v1.69.0)

Updates `io.grpc:grpc-stub` from 1.64.0 to 1.69.0
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.64.0...v1.69.0)

---
updated-dependencies:
- dependency-name: io.grpc:grpc-netty
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: io.grpc:grpc-protobuf
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: io.grpc:grpc-stub
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

hiero-dependency-versions/build.gradle.kts

@@ -35,7 +35,7 @@ val besu = "24.3.3"
 val bouncycastle = "1.79"
 val dagger = "2.42"
 val eclipseCollections = "11.1.0"
-val grpc = "1.64.0"
+val grpc = "1.69.0"
 val hederaCryptography = "0.1.1-SNAPSHOT"
 val helidon = "4.1.6"
 val jackson = "2.16.0"