python3-protobuf: update to 7.35.1.

[nazaradeh]

Important notes

• Closes Anki fails to start #62030
• The anki package is currently unfunctional. Anki will not run due to python3-protobuf being outdated.
• I believe the issue started when the protobuf package (separate from python3-protobuf) was updated from 25.2 to 35.1, which updated protoc to 7.35.1. Anki uses the system protoc when building, so newer Anki packages contained protobuf code generated for 7.35.1. However, python3-protobuf remained at 5.29.4, causing a runtime major-version mismatch. Updating python3-protobuf to 7.35.1 brings the compiler and Python runtime back into alignment, which thus also solves the Anki bug.

Testing the changes

• I tested the changes in this PR: YES
• Tested by running Anki, which uses this package as a runtime dependency.

Local build testing

• I built this PR locally for my native architecture, (x86)
• I built this PR locally for these architectures (if supported. mark crossbuilds):
  • aarch64-musl

[nazaradeh]

Vis: @Duncaen, I believe the bug is related to #61947