Bump MSRV to 1.79 #268

Job	Run time
build with wasm-pack	2m 58s
cargo test (macos)	10m 16s
Check cargo fmt	30s
cargo check	10m 50s
cargo test (macos-aarch64)	13m 23s
Verify MSRV (Min Supported Rust Version)	8m 43s
Verify Vendored Code	55s
cargo test (win64)	58m 33s
cargo test datafusion-cli (amd64)	4m 8s
cargo test (amd64)	10m 34s
cargo test doc (amd64)	15m 29s
cargo doc	4m 2s
cargo examples (amd64)	13m 38s
Run sqllogictest with Postgres runner	3m 43s
cargo test pyarrow (amd64)	3m 7s
verify benchmark results (amd64)	12m 33s
check configs.md and ***_functions.md is up-to-date	3m 0s
cargo test hash collisions (amd64)	17m 26s
check Cargo.toml formatting	3m 2s
clippy	5m 43s
	3h 22m 33s

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