chore(deps): bump addons-linter from 6.20.0 to 6.21.0 (#3027) (#3028)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: willdurand

package-lock.json

@@ -60,7 +60,7 @@
   "dependencies": {
     "@babel/runtime": "7.21.0",
     "@devicefarmer/adbkit": "3.2.3",
-    "addons-linter": "6.20.0",
+    "addons-linter": "6.21.0",
     "bunyan": "1.8.15",
     "camelcase": "7.0.1",
     "chrome-launcher": "0.15.1",