Release tracking PR: `secp256k1-sys 0.10.0` #1279

Job	Run time
Test - beta toolchain	32s
Test 32-bit version	50s
Check for changes to the public API	1m 30s
Cross test	1m 12s
Test - 1.56.1 toolchain	5m 30s
Test - nightly toolchain	3m 36s
Test - stable toolchain	3m 46s
WASM	1m 56s
	18m 52s

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