Update substrait requirement from 0.42 to 0.50 #507

Job	Run time
Check cargo fmt	39s
cargo check	40s
build with wasm-pack	36s
cargo test (macos-aarch64)	18s
cargo test (macos)	19s
Verify MSRV (Min Supported Rust Version)	4m 38s
cargo test (win64)	1m 23s
Verify Vendored Code	31s
check configs.md and ***_functions.md is up-to-date	0s
check Cargo.toml formatting	0s
clippy	0s
cargo test hash collisions (amd64)	0s
cargo doc	0s
cargo test (amd64)	0s
cargo test datafusion-cli (amd64)	0s
cargo test doc (amd64)	0s
cargo examples (amd64)	0s
Run sqllogictest with Postgres runner	0s
verify benchmark results (amd64)	0s
cargo test pyarrow (amd64)	0s
	9m 4s

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