build(deps): bump eslint in /test/spec/ESLintExtensionTest-files/es6

Bumps [eslint](https://github.com/eslint/eslint) from 6.0.0 to 9.26.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/v9.26.0/CHANGELOG.md)
- [Commits](eslint/eslint@v6.0.0...v9.26.0)

---
updated-dependencies:
- dependency-name: eslint
  dependency-version: 9.26.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

test/spec/ESLintExtensionTest-files/es6/package.json

@@ -8,6 +8,6 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "eslint": "6.0.0"
+    "eslint": "9.26.0"
   }
 }