fix: add elliptic override for GHSA-848j-6mx2-7j84

Add pnpm.overrides.elliptic to prevent version regression on
the transitive elliptic vulnerability (CVE-2025-14505).

Vulnerability path:
@kinvolk/headlamp-plugin → vite-plugin-node-polyfills →
node-stdlib-browser → crypto-browserify → browserify-sign → elliptic

Note: pnpm audit will still report the vulnerability until
upstream publishes elliptic 6.6.2+. This override safeguards
against pulling a worse version.

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

package.json

@@ -50,6 +50,7 @@
     "tar": "^7.5.11",
     "undici": "^7.24.3",
     "vite": ">=6.4.2",
-    "lodash": ">=4.18.0"
+    "lodash": ">=4.18.0",
+    "elliptic": ">=6.6.1"
   }
 }