Remove duplicate tar/undici from devDependencies (already in pnpm.overrides)

Consolidates dual override blocks by removing the duplicate entries
from devDependencies. These packages are already pinned via pnpm.overrides
and should not appear in devDependencies.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

package.json

@@ -52,9 +52,7 @@
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "react-router-dom": "^5.3.0",
-    "tar": "^7.5.11",
     "typescript": "~5.6.2",
-    "undici": "^7.24.3",
     "vitest": "^3.0.5"
   }
 }