meta: bump shiki from 3.19.0 to 3.20.0 in the remark group (#543)

Author: dependabot[bot]

npm-shrinkwrap.json

@@ -73,7 +73,7 @@
     "remark-stringify": "^11.0.0",
     "rolldown": "^1.0.0-beta.56",
     "semver": "^7.7.3",
-    "shiki": "^3.19.0",
+    "shiki": "^3.20.0",
     "tinyglobby": "^0.2.15",
     "unified": "^11.0.5",
     "unist-builder": "^4.0.0",