Reinstate 1.65 MSRV #2484

Job	Run time
Build [debug feature]	8s
Build Benchmarks	33s
Build Benchmarks (w/ yoga)	42s
Build Examples	36s
MSRV Build [Rust 1.65]	1m 19s
Clippy	38s
Documentation	18s
Test Fixture Formatting	9s
Rustfmt	6s
Markdown Lint	3s
Test Suite [alloc + all algorithms]	55s
Test Suite [std + block)]	1m 9s
Test Suite [default features]	1m 5s
Test Suite [default except content_size]	58s
Test Suite [default + serde]	1m 3s
Test Suite [std + flexbox]	58s
Test Suite [std + flexbox + detailed_layout_info]	55s
Test Suite [std + grid]	55s
Test Suite [std + grid + detailed_layout_info]	1m 9s
Test Suite [alloc + no algorithms]	1m 1s
Test Suite [std (no algorithms)]	1m 13s
Test Suite [no features]	1m 9s
	17m 2s

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