Fixing protobuf #51

Job	Run time
cargo test (macos)	3m 19s
cargo check	3m 27s
build with wasm-pack	2m 28s
cargo test (win64)	7m 21s
Check cargo fmt	40s
cargo test (macos-aarch64)	8m 1s
Verify MSRV (Min Supported Rust Version)	5m 5s
Verify Vendored Code	1m 0s
cargo test (amd64)	0s
cargo test datafusion-cli (amd64)	0s
cargo doc	0s
cargo examples (amd64)	0s
cargo test doc (amd64)	0s
cargo test pyarrow (amd64)	0s
verify benchmark results (amd64)	0s
check Cargo.toml formatting	0s
clippy	0s
cargo test hash collisions (amd64)	0s
Run sqllogictest with Postgres runner	0s
check configs.md is up-to-date	0s
	31m 21s

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