build(deps-dev): bump doctrine/instantiator from 2.0.0 to 2.1.0

Bumps [doctrine/instantiator](https://github.com/doctrine/instantiator) from 2.0.0 to 2.1.0.
- [Release notes](https://github.com/doctrine/instantiator/releases)
- [Commits](doctrine/instantiator@2.0.0...2.1.0)

---
updated-dependencies:
- dependency-name: doctrine/instantiator
  dependency-version: 2.1.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]