Rust

Update parquet requirement from 48.0.0 to 50.0.0 #730

Job	Run time
Check cargo fmt	39s
cargo check	2m 22s
build with wasm-pack	1m 47s
cargo test (mac)	3m 56s
Verify MSRV	4m 39s
Verify Vendored Code	44s
cargo test (win64)	6m 17s
cargo test doc (amd64)	0s
cargo test datafusion-cli (amd64)	0s
cargo test (amd64)	0s
cargo examples (amd64)	0s
cargo doc	0s
clippy	0s
Run sqllogictest with Postgres runner	0s
cargo test pyarrow (amd64)	0s
verify benchmark results (amd64)	0s
check Cargo.toml formatting	0s
check configs.md is up-to-date	0s
cargo test hash collisions (amd64)	0s
	20m 24s

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