Bump MSRV to 1.71 #1950

Job	Run time
Measure coverage	52s
Validate external types appearing in public API	58s
Clippy	27s
Check cross compilation targets	28s
Feature Powerset	34s
Cargo Deny	16s
MSRV	32s
Verify that no-std modes do not rely on libstd (--no-default-features)	12s
Cargo Package	27s
Check for documentation errors (stable)	26s
Verify that no-std modes do not rely on libstd (--no-default-features --features alloc)	8s
Check for documentation errors (beta)	33s
Format	9s
Check for documentation errors (nightly)	56s
Check semver compatibility	3m 8s
Build+test (--all-features, stable)	47s
Build+test (stable, ubuntu-latest)	50s
Build+test (--features=alloc, stable, ubuntu-latest)	43s
Build+test (--no-default-features, stable, ubuntu-latest)	33s
Build+test (--no-default-features --features alloc,std, stable, ubuntu-latest)	36s
Build+test (--all-features, --release, stable, ubuntu-latest)	1m 33s
Build+test (--all-features, nightly, ubuntu-latest)	50s
Build+test (--all-features, beta, ubuntu-latest)	48s
Build+test (--no-default-features --features alloc,std,aws_lc_rs, stable, macos-latest)	50s
Build+test (--no-default-features --features alloc,std,aws_lc_rs, stable, windows-latest)	1m 45s
Build+test (--no-default-features --features alloc,std,aws_lc_rs, stable, ubuntu-latest)	41s
	20m 2s

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