chore(docs): bump mermaid 11.12→11.13 and @astrojs/starlight 0.37.6→0.37.7 (#20464)

Author: Copilot

docs/package-lock.json

@@ -17,11 +17,11 @@
     "test:debug": "playwright test --debug"
   },
   "dependencies": {
-    "@astrojs/starlight": "^0.37.6",
+    "@astrojs/starlight": "^0.37.7",
     "@primer/octicons": "^19.22.0",
     "astro": "^5.18.0",
     "astro-mermaid": "^1.3.1",
-    "mermaid": "^11.12.3",
+    "mermaid": "^11.13.0",
     "sharp": "^0.34.5",
     "starlight-blog": "^0.25.3",
     "starlight-changelogs": "^0.4.0",