Bump phpdocumentor/reflection-docblock from 5.6.3 to 5.6.4

Bumps [phpdocumentor/reflection-docblock](https://github.com/phpDocumentor/ReflectionDocBlock) from 5.6.3 to 5.6.4.
- [Release notes](https://github.com/phpDocumentor/ReflectionDocBlock/releases)
- [Commits](phpDocumentor/ReflectionDocBlock@5.6.3...5.6.4)

---
updated-dependencies:
- dependency-name: phpdocumentor/reflection-docblock
  dependency-version: 5.6.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]