[engsys] Update eslint-plugin-markdown to ~3.0.0 (Azure#22625)

Author: timovv

common/config/rush/pnpm-lock.yaml

@@ -94,6 +94,6 @@
     "source-map-support": "^0.5.9",
     "mocha-junit-reporter": "^2.0.0",
     "typescript": "~4.2.0",
-    "eslint-plugin-markdown": "~2.2.1"
+    "eslint-plugin-markdown": "~3.0.0"
   }
 }