Add psm to the crate whitelist

Author: oli-obk

src/tools/tidy/src/deps.rs

@@ -134,6 +134,7 @@ const WHITELIST: &[Crate<'_>] = &[
     Crate("polonius-engine"),
     Crate("ppv-lite86"),
     Crate("proc-macro2"),
+    Crate("psm"),
     Crate("punycode"),
     Crate("quick-error"),
     Crate("quote"),