Bug 1637381: Fix reference to old tarball for win64-clang-tidy r=glandium

Differential Revision: https://phabricator.services.mozilla.com/D76420

taskcluster/ci/toolchain/clang-tidy.yml

@@ -85,7 +85,6 @@ win64-clang-tidy:
             - 'build/build-clang/clang-tidy-win64.json'
         resources:
             - 'build/build-clang/clang-tidy-win64.json'
-        toolchain-artifact: public/build/clang-tidy.tar.bz2
         tooltool-downloads: internal
     fetches:
         fetch: