[rust] Update which from 7.0.3 to 8.0.0 (#15965)

Author: musicinmybrain

rust/Cargo.lock

@@ -35,7 +35,7 @@ walkdir = "2.5.0"
 debpkg = "0.6.0"
 anyhow = { version = "1.0.98", default-features = false, features = ["backtrace", "std"] }
 apple-flat-package = "0.20.0"
-which = "7.0.3"
+which = "8.0.0"
 fs2 = "0.4.3"
 fs_extra = "1.3.0"