swap over to using CDN to fetch TUF roots (sigstore#609)

Signed-off-by: Bob Callaway <[email protected]>
Signed-off-by: Emile Baez <[email protected]>

Author: bobcallaway

sigstore/_internal/tuf.py

@@ -47,8 +47,8 @@
 
 logger = logging.getLogger(__name__)
 
-DEFAULT_TUF_URL = "https://sigstore-tuf-root.storage.googleapis.com/"
-STAGING_TUF_URL = "https://tuf-root-staging.storage.googleapis.com/"
+DEFAULT_TUF_URL = "https://tuf-repo-cdn.sigstore.dev"
+STAGING_TUF_URL = "https://tuf-repo-cdn.sigstage.dev"
 
 
 @lru_cache()