Move to build deps to devDeps

This is not part of the bundled part.
Make that separation.

Bug: none
Change-Id: I9f8dda77b0526cb2b2f0cb7e8d4ac2469137894d
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6406322
Reviewed-by: Simon Zünd <[email protected]>
Commit-Queue: Nikolay Vitkov <[email protected]>

Author: Lightning00Blade

front_end/third_party/codemirror.next/package.json

@@ -33,7 +33,9 @@
     "@lezer/lr": "1.4.2",
     "@replit/codemirror-indentation-markers": "6.5.0",
     "@replit/codemirror-lang-svelte": "6.0.0",
-    "rollup-plugin-dts": "6.1.1",
     "style-mod": "4.1.0"
+  },
+  "devDependencies": {
+    "rollup-plugin-dts": "6.1.1"
   }
 }