Use --versioned-dirs with 'cargo vendor'

This cuts the time to run 'cargo vendor' in half, from 20s to 10s.

Bug: http://b/339424309
Test: treehugger
Change-Id: Iaa93220a74c6ab7eedc8d5c641d2ab765c58caa5

tools/external_crates/crate_tool/src/pseudo_crate.rs

@@ -104,7 +104,7 @@ impl PseudoCrate<CargoVendorClean> {
     fn crates(&self) -> &CrateCollection {
         self.extra.crates.get_or_init(|| {
             Command::new("cargo")
-                .args(["vendor"])
+                .args(["vendor", "--versioned-dirs"])
                 .current_dir(&self.path)
                 .run_quiet_and_expect_success()
                 .unwrap();