chore: add update script for @decocms/* packages

Adds `bun run update` script that uses npm-check-updates to bump
@decocms/* dependencies to their latest versions and reinstalls.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: igoramf

package.json

@@ -23,7 +23,8 @@
     "knip:fix": "knip --fix",
     "clean": "rm -rf node_modules .cache dist .wrangler/state node_modules/.vite && npm install",
     "tailwind:lint": "tsx scripts/tailwind-lint.ts",
-    "tailwind:fix": "tsx scripts/tailwind-lint.ts --fix"
+    "tailwind:fix": "tsx scripts/tailwind-lint.ts --fix",
+    "update": "bunx npm-check-updates -u -f '@decocms/*' && bun install"
   },
   "author": "deco.cx",
   "license": "MIT",