Bump MSRV #4640

Job	Run time
rustfmt-clippy	3m 15s
build-windows (cargo-build, x86_64-pc-windows-msvc)	9m 35s
build-windows (cargo-test, x86_64-pc-windows-msvc)	9m 26s
build-unix (beta-build)	4m 38s
build-macos (Cargo build (x64), cargo-build, x86_64-apple-darwin)	4m 54s
build-windows (cargo-c, x86_64-pc-windows-gnu)	13m 15s
build-unix (1.70.0-tests)	7m 4s
build-macos (Cargo test (x64), cargo-test, x86_64-apple-darwin)	4m 42s
build-unix (aom-tests)	7m 9s
build-macos (Cargo C-build (x64), cargo-c, x86_64-apple-darwin)	7m 9s
build-unix (dav1d-tests)	8m 28s
build-macos (Cargo build (Arm64), cargo-build, aarch64-apple-darwin)	4m 8s
build-unix (no-asm-tests)	14m 18s
build-macos (Cargo C-build (Arm64), cargo-c, aarch64-apple-darwin)	6m 12s
build-unix (grcov-codecov)	17m 20s
build-unix (bench)	5m 17s
build-unix (doc)	4m 14s
build-unix (cargo-c)	6m 42s
build-unix (check-no-default)	2m 28s
build-unix (check-extra-feats)	3m 35s
build-unix (check-unstable-feats)	3m 28s
build-unix (fuzz)	6m 23s
build-unix (dav1d-tests-arm64, stable)	9m 44s
	2h 43m 24s

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