Bump bentools/iterable-functions from 2.1 to 2.1.1

Bumps [bentools/iterable-functions](https://github.com/bpolaszek/php-iterable-functions) from 2.1 to 2.1.1.
- [Release notes](https://github.com/bpolaszek/php-iterable-functions/releases)
- [Commits](bpolaszek/php-iterable-functions@2.1...2.1.1)

---
updated-dependencies:
- dependency-name: bentools/iterable-functions
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]