chore(deps): update dependency protoc to v29.1

[renovate]

This PR contains the following updates:

Package	Update	Change
protoc	minor	29.0 -> 29.1

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Release Notes

protocolbuffers/protobuf (protoc)

v29.1: Protocol Buffers v29.1

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Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

Java

• Rename maven to protobuf_maven in MODULE.bazel (#​18641) (#​19477) (protocolbuffers/protobuf@ba6da44)

Kotlin

• Rename maven to protobuf_maven in MODULE.bazel (#​18641) (#​19477) (protocolbuffers/protobuf@ba6da44)

Python

• Revert "Remove deprecated service.py usages from test". For 29.x only (#​19434) (protocolbuffers/protobuf@5864b50)

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