Update protobuf requirement from ==6.33.* to ==7.34.* (#5945)

Updates the requirements on [protobuf](https://github.com/protocolbuffers/protobuf) to permit the latest version.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Commits](https://github.com/protocolbuffers/protobuf/commits)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-version: 7.34.0
  dependency-type: direct:production
...

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pyproject.toml

@@ -77,7 +77,7 @@ dependencies = [
   "phonenumberslite==9.0.*",
   "Pillow==12.1.*",
   "pretix-plugin-build",
-  "protobuf==6.33.*",
+  "protobuf==7.34.*",
   "psycopg2-binary",
   "pycountry",
   "pycparser==3.0",