Bug 1800113 - Avoid supply-chain changes preventing to vendor rust code. r=firefox-build-system-reviewers,nalexander

Differential Revision: https://phabricator.services.mozilla.com/D162070

python/mozbuild/mozbuild/vendor/vendor_rust.py

@@ -196,6 +196,7 @@ class VendorRust(MozbuildObject):
             f
             for f in self.repository.get_changed_files("M")
             if os.path.basename(f) not in ("Cargo.toml", "Cargo.lock")
+            and not f.startswith("supply-chain/")
         ]
         if modified:
             self.log(