fix(deps): update dependency @mdit/plugin-plantuml to v2

Author: renovate[bot]

plugins/markdown/plugin-markdown-chart/package.json

@@ -57,7 +57,7 @@
   },
   "dependencies": {
     "@mdit/plugin-container": "^1.0.2",
-    "@mdit/plugin-plantuml": "^1.0.4",
+    "@mdit/plugin-plantuml": "^2.0.0",
     "@vuepress/helper": "workspace:*",
     "@vueuse/core": "catalog:",
     "vue": "catalog:"