chore(deps): update dependency protobuf to v30.2 (#1557)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| protobuf | bazel_dep | minor | `30.1` -> `30.2` |

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examples/grpc_example/MODULE.bazel

@@ -16,7 +16,7 @@ bazel_dep(name = "cgrindel_bazel_starlib", version = "0.25.2")
 
 # Required by custom swift proto compiler plugin:
 bazel_dep(name = "bazel_skylib", version = "1.7.1")
-bazel_dep(name = "protobuf", version = "30.1")
+bazel_dep(name = "protobuf", version = "30.2")
 
 # Required for proto_library targets:
 bazel_dep(name = "rules_proto", version = "7.1.0")