fix: add @nx/esbuild to devDependencies (update-packages executor)

The update-packages project uses @nx/esbuild:esbuild executor but the
package was missing from package.json. Tsconfig changes in this PR make
update-packages 'affected', so CI tried to build it and failed.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: chrisjwalk-bot

package.json

@@ -93,6 +93,7 @@
     "@eslint/js": "10.0.1",
     "@nx/angular": "22.5.4",
     "@nx/devkit": "22.5.4",
+    "@nx/esbuild": "22.5.4",
     "@nx/eslint": "22.5.4",
     "@nx/eslint-plugin": "22.5.4",
     "@nx/js": "22.5.4",