fix(ml): Re-generate MLModelDownloader proto

[ncooke3]

Failing workflows:

• mldmodeldownloader: https://github.com/firebase/firebase-ios-sdk/actions/runs/17119675199
• release: https://github.com/firebase/firebase-ios-sdk/actions/runs/17117578278/job/48552175995

swift-protobug 1.31.0 was released a few days and included a new deprecation: apple/swift-protobuf@37efaf6. MLModelDownloader picked up this new version and surfaces warnings in the lib/spec lints.

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	1 Warning
⚠️	Did you forget to add a changelog entry? (Add #no-changelog to the PR description to silence this warning.)

Generated by 🚫 Danger

[ncooke3]

~ brew install swift-protobuf ~ firebase-ios-sdk (main) % cd FirebaseMLModelDownloader/Sources/proto  ~ proto (main) % protoc --swift_out=. my.proto