fix(deps): add missing webpack-dev-server override (#443)

PR #442 (1c3b6df) added webpack-dev-server@5.2.4 to package-lock.json
but the corresponding `overrides` entry never made it into package.json.
`npm ci` on main now fails with "Missing: webpack-dev-server@4.15.2 from
lock file" because the natural dep tree (via @wordpress/scripts) wants
4.15.2 while the lockfile has 5.2.4 with no override to bridge the gap.

This breaks the release workflow — without it, the changesets action
cannot install deps to refresh PR #403 or publish 4.8.5.

Adding the missing override is sufficient; the lockfile is already at
the correct resolution and `npm install --package-lock-only` is a no-op.
Verified locally: `npm ci --dry-run` now exits 0.

Author: josephfusco

package.json

@@ -39,6 +39,7 @@
   "overrides": {
     "serialize-javascript": "^7.0.5",
     "uuid": "^11.1.1",
+    "webpack-dev-server": "^5.2.4",
     "@typescript-eslint/typescript-estree": {
       "minimatch": "^9.0.7"
     },