Bump versions.grpc from 1.59.0 to 1.60.0 (#28)

Bumps `versions.grpc` from 1.59.0 to 1.60.0.

Updates `io.grpc:grpc-bom` from 1.59.0 to 1.60.0
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.59.0...v1.60.0)

Updates `io.grpc:protoc-gen-grpc-java` from 1.59.0 to 1.60.0
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.59.0...v1.60.0)

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

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

build.gradle

@@ -35,7 +35,7 @@ allprojects {
   ext {
     versions = [
       wiremock: "3.2.0",
-      grpc    : "1.59.0",
+      grpc    : "1.60.0",
       protobuf: "3.25.0"
     ]