Bump MSRV to 1.71 #1954

Job	Run time
Format	7s
Clippy	28s
Cargo Deny	8s
Check for documentation errors (stable)	45s
Check for documentation errors (beta)	35s
Check for documentation errors (nightly)	31s
Check cross compilation targets	28s
Validate external types appearing in public API	1m 9s
Measure coverage	56s
MSRV	29s
Feature Powerset	33s
Verify that no-std modes do not rely on libstd (--no-default-features)	7s
Cargo Package	30s
Verify that no-std modes do not rely on libstd (--no-default-features --features alloc)	14s
Check semver compatibility	2m 53s
Build+test (--all-features, stable)	53s
Build+test (stable, ubuntu-latest)	57s
Build+test (--features=alloc, stable, ubuntu-latest)	47s
Build+test (--no-default-features, stable, ubuntu-latest)	34s
Build+test (--no-default-features --features alloc,std, stable, ubuntu-latest)	37s
Build+test (--all-features, --release, stable, ubuntu-latest)	1m 19s
Build+test (--all-features, nightly, ubuntu-latest)	51s
Build+test (--all-features, beta, ubuntu-latest)	53s
Build+test (--no-default-features --features alloc,std,aws_lc_rs, stable, macos-latest)	1m 16s
Build+test (--no-default-features --features alloc,std,aws_lc_rs, stable, windows-latest)	3m 24s
Build+test (--no-default-features --features alloc,std,aws_lc_rs, stable, ubuntu-latest)	49s
	22m 13s

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