Bump com.google.protobuf:protobuf-java from 3.25.3 to 4.28.0 in /core

Bumps [com.google.protobuf:protobuf-java](https://github.com/protocolbuffers/protobuf) from 3.25.3 to 4.28.0.
- [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)

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

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

core/build.gradle

@@ -17,7 +17,7 @@ dependencies {
     api 'com.madgag.spongycastle:core:1.58.0.0'
     api 'com.lambdaworks:scrypt:1.4.0'
     api 'org.junit.jupiter:junit-jupiter-api:5.10.3'
-    api 'com.google.protobuf:protobuf-java:3.25.3'
+    api 'com.google.protobuf:protobuf-java:4.28.0'
     api 'org.slf4j:slf4j-jdk14:2.0.13'
     api 'org.json:json:20240303'
     api 'com.squareup.okhttp:okhttp:2.7.5'