Bump eslint from 9.25.1 to 9.26.0 in /tools/sdk-testgen (Azure#10529)

Bumps [eslint](https://github.com/eslint/eslint) from 9.25.1 to 9.26.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/main/CHANGELOG.md)
- [Commits](eslint/eslint@v9.25.1...v9.26.0)

---
updated-dependencies:
- dependency-name: eslint
  dependency-version: 9.26.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]