bump to v0.16.6 #847

Job	Run time
Build Documentation	39s
Check no_std	39s
build-ios	51s
Check (x86)	2m 20s
Check (x86_64)	1m 10s
Test Frida (ubuntu-latest, x86)	1m 15s
Test Gum (ubuntu-latest, x86)	1m 33s
Test Frida (ubuntu-latest, x86_64)	1m 6s
Test Gum (ubuntu-latest, x86_64)	1m 19s
Test Gum (macOS-latest, x86_64)	1m 9s
Test Frida (macOS-latest, x86_64)	1m 2s
Test Gum (windows-latest, x86)	3m 31s
Test Frida (windows-latest, x86)	2m 12s
Test Gum (windows-latest, x86_64)	2m 43s
Test Frida (windows-latest, x86_64)	2m 39s
Test Gum (aarch64, macOS-latest, aarch64-apple-darwin)	1m 6s
	25m 14s

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