MINOR: Bump io.grpc:grpc-bom from 1.69.1 to 1.70.0

Bumps [io.grpc:grpc-bom](https://github.com/grpc/grpc-java) from 1.69.1 to 1.70.0.
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.69.1...v1.70.0)

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

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

Author: dependabot[bot]

pom.xml

@@ -97,7 +97,7 @@ under the License.
     <dep.slf4j.version>2.0.16</dep.slf4j.version>
     <dep.guava-bom.version>33.4.0-jre</dep.guava-bom.version>
     <dep.netty-bom.version>4.1.115.Final</dep.netty-bom.version>
-    <dep.grpc-bom.version>1.69.1</dep.grpc-bom.version>
+    <dep.grpc-bom.version>1.70.0</dep.grpc-bom.version>
     <dep.protobuf-bom.version>3.25.5</dep.protobuf-bom.version>
     <dep.jackson-bom.version>2.18.2</dep.jackson-bom.version>
     <dep.hadoop.version>3.4.1</dep.hadoop.version>