Update proc-macro-crate requirement from 1.0.0 to 3.1.0 in /proc-macro-definitions #859

Job	Run time
Book	48s
Browser Test	1m 24s
Check on Rust 1.58 (macos)	33s
Minimal Versions	2m 20s
Miri	27s
Check on Rust stable (macos)	23s
Test	7s
Check on Rust beta (macos)	23s
Check on Rust nightly (macos)	21s
Check on Rust 1.58 (ubuntu)	34s
Check on Rust stable (ubuntu)	4s
Check on Rust beta (ubuntu)	16s
Check on Rust nightly (ubuntu)	11s
Check on Rust 1.58 (windows)	8s
Check on Rust stable (windows)	2s
Check on Rust beta (windows)	1s
Check on Rust nightly (windows)	3s
	8m 5s

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