chore: codify subtle >=2.50 dependency #287

Job	Run time
Build - x86_64-unknown-linux-gnu	1m 7s
Build - aarch64-unknown-linux-gnu	1m 13s
Build - aarch64-apple-darwin	1m 11s
Build - x86_64-apple-darwin	1m 19s
Build - x86_64-pc-windows-gnu	3m 22s
Test - x86_64-unknown-linux-gnu	1m 6s
Test - aarch64-unknown-linux-gnu	1m 44s
Test - x86_64-apple-darwin	1m 57s
Test - aarch64-apple-darwin	1m 2s
Test - x86_64-pc-windows-gnu	1m 36s
Publish	1s
	15m 38s

Provide feedback