fix(branchName): replace all forward slashes

lib/workers/repository/updates/flatten.js

@@ -57,7 +57,7 @@ function flattenUpdates(config, packageFiles) {
               ? updateConfig.depName
                   .replace('@types/', '')
                   .replace('@', '')
-                  .replace('/', '-')
+                  .replace(/\//g, '-')
                   .replace(/\s+/g, '-')
                   .toLowerCase()
               : undefined;