Bump the gradle group across 1 directory with 5 updates

Bumps the gradle group with 5 updates in the / directory:

| Package | From | To |
| --- | --- | --- |
| [io.grpc:grpc-protobuf](https://github.com/grpc/grpc-java) | `1.73.0` | `1.75.0` |
| [io.grpc:grpc-stub](https://github.com/grpc/grpc-java) | `1.73.0` | `1.75.0` |
| [io.grpc:grpc-netty-shaded](https://github.com/grpc/grpc-java) | `1.73.0` | `1.75.0` |
| [com.google.protobuf:protobuf-java](https://github.com/protocolbuffers/protobuf) | `4.31.1` | `4.32.0` |
| [org.assertj:assertj-core](https://github.com/assertj/assertj) | `3.27.3` | `3.27.4` |



Updates `io.grpc:grpc-protobuf` from 1.73.0 to 1.75.0
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.73.0...v1.75.0)

Updates `io.grpc:grpc-stub` from 1.73.0 to 1.75.0
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.73.0...v1.75.0)

Updates `io.grpc:grpc-netty-shaded` from 1.73.0 to 1.75.0
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.73.0...v1.75.0)

Updates `com.google.protobuf:protobuf-java` from 4.31.1 to 4.32.0
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](https://github.com/protocolbuffers/protobuf/commits)

Updates `io.grpc:grpc-stub` from 1.73.0 to 1.75.0
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.73.0...v1.75.0)

Updates `io.grpc:grpc-netty-shaded` from 1.73.0 to 1.75.0
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.73.0...v1.75.0)

Updates `org.assertj:assertj-core` from 3.27.3 to 3.27.4
- [Release notes](https://github.com/assertj/assertj/releases)
- [Commits](assertj/assertj@assertj-build-3.27.3...assertj-build-3.27.4)

---
updated-dependencies:
- dependency-name: io.grpc:grpc-protobuf
  dependency-version: 1.75.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: gradle
- dependency-name: io.grpc:grpc-stub
  dependency-version: 1.75.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: gradle
- dependency-name: io.grpc:grpc-netty-shaded
  dependency-version: 1.75.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: gradle
- dependency-name: com.google.protobuf:protobuf-java
  dependency-version: 4.32.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: gradle
- dependency-name: io.grpc:grpc-stub
  dependency-version: 1.75.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: gradle
- dependency-name: io.grpc:grpc-netty-shaded
  dependency-version: 1.75.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: gradle
- dependency-name: org.assertj:assertj-core
  dependency-version: 3.27.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: gradle
...

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

Author: dependabot[bot]

build.gradle

@@ -86,8 +86,8 @@ tasks.sourcesJar {
 // All it does is complain about generated code.
 javadoc { options.addStringOption('Xdoclint:none', '-quiet') }
 
-def grpcVersion = "1.73.0"
-def protocVersion = "4.31.1"
+def grpcVersion = "1.75.0"
+def protocVersion = "4.32.0"
 def authzedProtoCommit = "v1.45.0"
 def bufDir = "${buildDir}/buf"
 def protocPlatformTag = project.findProperty('protoc_platform') ? ":${protoc_platform}" : ""
@@ -142,7 +142,7 @@ configurations {
 // Test things
 dependencies {
   intTestImplementation "junit:junit:4.13.2"
-    intTestImplementation "org.assertj:assertj-core:3.27.3"
+    intTestImplementation "org.assertj:assertj-core:3.27.4"
 }
 
 tasks.register('integrationTest', Test) {