Update proc-macro-crate requirement in /proc-macro-definitions #854

Job	Run time
Book	53s
Browser Test	1m 22s
Minimal Versions	41s
Miri	30s
Check on Rust 1.58 (macos)	15s
Test	11s
Check on Rust stable (macos)	1s
Check on Rust beta (macos)	13s
Check on Rust nightly (macos)	14s
Check on Rust 1.58 (ubuntu)	29s
Check on Rust stable (ubuntu)	16s
Check on Rust beta (ubuntu)	2s
Check on Rust nightly (ubuntu)	13s
Check on Rust 1.58 (windows)	1s
Check on Rust stable (windows)	1s
Check on Rust beta (windows)	1s
Check on Rust nightly (windows)	1s
	5m 24s

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