Bump google-protobuf in /docs in the bundler group across 1 directory

Bumps the bundler group with 1 update in the /docs directory: [google-protobuf](https://github.com/protocolbuffers/protobuf).


Updates `google-protobuf` from 3.25.3 to 4.29.2
- [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: google-protobuf
  dependency-type: indirect
  dependency-group: bundler
...

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

docs/Gemfile.lock

@@ -29,7 +29,9 @@ GEM
     ffi (1.16.3)
     forwardable-extended (2.6.0)
     gemoji (4.1.0)
-    google-protobuf (3.25.3-x86_64-linux)
+    google-protobuf (4.29.2-x86_64-linux)
+      bigdecimal
+      rake (>= 13)
     html-pipeline (2.14.3)
       activesupport (>= 2)
       nokogiri (>= 1.4)
@@ -104,9 +106,8 @@ GEM
       strscan (>= 3.0.9)
     rouge (4.2.1)
     safe_yaml (1.0.5)
-    sass-embedded (1.69.5)
-      google-protobuf (~> 3.23)
-      rake (>= 13.0.0)
+    sass-embedded (1.83.0-x86_64-linux-gnu)
+      google-protobuf (~> 4.28)
     strscan (3.1.0)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)