Bump bref/bref from 2.1.15 to 2.1.16

Bumps [bref/bref](https://github.com/brefphp/bref) from 2.1.15 to 2.1.16.
- [Release notes](https://github.com/brefphp/bref/releases)
- [Commits](brefphp/bref@2.1.15...2.1.16)

---
updated-dependencies:
- dependency-name: bref/bref
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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