Update protobuf requirement from <=3.20 to <=6.32.1

Updates the requirements on [protobuf](https://github.com/protocolbuffers/protobuf) to permit the latest version.
- [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: protobuf
  dependency-version: 6.32.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -35,7 +35,7 @@ dev = [
     # For testing older versions of Streamlit: https://discuss.streamlit.io/t/modulenotfounderror-no-module-named-altair-vegalite-v4/42921
     "altair<5",
     # For testing older versions of Streamlit: https://discuss.streamlit.io/t/streamlit-run-with-protobuf-error/25632/3
-    "protobuf<=3.20",
+    "protobuf<=6.32.1",
     "mkdocs-material>=9.6.20",
 ]