chore(deps): update dependency protobuf to v29.3 (#1436)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| protobuf | bazel_dep | minor | `29.2` -> `29.3` |

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the
rebase/retry checkbox.

👻 **Immortal**: This PR will be recreated if closed unmerged. Get
[config
help](https://redirect.github.com/renovatebot/renovate/discussions) if
that's undesired.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR has been generated by [Renovate
Bot](https://redirect.github.com/renovatebot/renovate).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOC45NC4xIiwidXBkYXRlZEluVmVyIjoiMzguOTQuMSIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOltdfQ==-->

Co-authored-by: cgrindel-self-hosted-renovate[bot] <139595543+cgrindel-self-hosted-renovate[bot]@users.noreply.github.com>

Author: cgrindel-self-hosted-renovate[bot]

examples/grpc_example/MODULE.bazel

@@ -53,7 +53,7 @@ bazel_dep(name = "rules_proto", version = "7.1.0")
 
 # Gazelle currently needs protobuf to be named com_google_protobuf.
 # If they fix this, we can remove the repo_name argument.
-bazel_dep(name = "protobuf", version = "29.2", repo_name = "com_google_protobuf")
+bazel_dep(name = "protobuf", version = "29.3", repo_name = "com_google_protobuf")
 
 apple_cc_configure = use_extension(
     "@apple_support//crosstool:setup.bzl",

examples/grpc_package_example/MODULE.bazel

@@ -53,7 +53,7 @@ bazel_dep(name = "rules_proto", version = "7.1.0")
 
 # Gazelle currently needs protobuf to be named com_google_protobuf.
 # If they fix this, we can remove the repo_name argument.
-bazel_dep(name = "protobuf", version = "29.2", repo_name = "com_google_protobuf")
+bazel_dep(name = "protobuf", version = "29.3", repo_name = "com_google_protobuf")
 
 apple_cc_configure = use_extension(
     "@apple_support//crosstool:setup.bzl",