Bump com.google.protobuf:protobuf-java from 3.23.3 to 3.24.4 in /backend

Bumps [com.google.protobuf:protobuf-java](https://github.com/protocolbuffers/protobuf) from 3.23.3 to 3.24.4.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](protocolbuffers/protobuf@v3.23.3...v3.24.4)

---
updated-dependencies:
- dependency-name: com.google.protobuf:protobuf-java
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

backend/build.gradle.kts

@@ -166,7 +166,7 @@ dependencies {
     // => CVE-2023-1370
     implementation("net.minidev:json-smart:2.5.0")
     // CVE-2022-3171
-    implementation("com.google.protobuf:protobuf-java:3.23.3")
+    implementation("com.google.protobuf:protobuf-java:3.24.4")
     // => CVE-2021-37136, CVE-2021-37137, CVE-2021-43797
     implementation("io.netty:netty-all:4.1.94.Final") {
         exclude(group = "io.netty", module = "netty-tcnative-classes")