CI: Check workflows and actions with zizmor #6369

Job	Run time
Test no-Orchard on Linux	31s
Test Orchard on Linux	1s
Test NU7 on Linux	1s
Slow Test Orchard on Linux	25s
Slow Test NU7 on Linux	19s
Latest build on ubuntu-latest	32s
Latest build on windows-latest	39s
Latest build on macOS-latest	30s
Build target thumbv7em-none-eabihf	34s
Check ZFuture build on Linux	17s
Test no-Orchard on macOS	22s
Check ZFuture build on macOS	23s
Bitrot check	1m 35s
Check ZFuture build on Windows	17s
Test Orchard on macOS	30s
Build target wasm32-wasi	57s
Clippy (MSRV)	15s
Test no-Orchard on Windows	3m 33s
Clippy (beta)	14s
Code coverage	37s
Test Orchard on Windows	1m 0s
Test NU7 on Windows	1m 9s
Intra-doc links	18s
Rustfmt	14s
protobuf consistency	12s
UUID validity	6s
Required status checks have passed	1s
	15m 32s

Provide feedback