Bump @iobroker/create-adapter from 2.6.5 to 3.1.2 in /express/backend

Bumps [@iobroker/create-adapter](https://github.com/ioBroker/create-adapter) from 2.6.5 to 3.1.2.
- [Release notes](https://github.com/ioBroker/create-adapter/releases)
- [Changelog](https://github.com/ioBroker/create-adapter/blob/master/CHANGELOG.md)
- [Commits](ioBroker/create-adapter@v2.6.5...v3.1.2)

---
updated-dependencies:
- dependency-name: "@iobroker/create-adapter"
  dependency-version: 3.1.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Author: dependabot[bot]