chore(deps): update commitlint monorepo to v8

Author: renovate-bot

package.json

@@ -51,8 +51,8 @@
     ]
   },
   "devDependencies": {
-    "@commitlint/cli": "^7.2.1",
-    "@commitlint/config-conventional": "^7.1.2",
+    "@commitlint/cli": "^8.0.0",
+    "@commitlint/config-conventional": "^8.0.0",
     "@sourcegraph/extension-api-stubs": "^0.2.0",
     "@sourcegraph/prettierrc": "^2.2.0",
     "@sourcegraph/tsconfig": "^4.0.0",