Bump shelljs and eslint

Removes [shelljs](https://github.com/shelljs/shelljs). It's no longer used after updating ancestor dependency [eslint](https://github.com/eslint/eslint). These dependencies need to be updated together.


Removes `shelljs`

Updates `eslint` from 1.10.3 to 9.39.2
- [Release notes](https://github.com/eslint/eslint/releases)
- [Commits](https://github.com/eslint/eslint/compare/v1.10.3...v9.39.2)

---
updated-dependencies:
- dependency-name: shelljs
  dependency-version: 
  dependency-type: indirect
- dependency-name: eslint
  dependency-version: 9.39.2
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -56,7 +56,7 @@
     "deamdify": "^0.2.0",
     "deepcopy": "^0.6.1",
     "del": "^2.0.2",
-    "eslint": "^1.5.1",
+    "eslint": "^9.39.2",
     "eslint-config-pebble": "^1.2.0",
     "eslint-plugin-standard": "^1.3.1",
     "gulp": "^5.0.1",