Bump databases from 0.5.5 to 0.6.0 (#680)

Bumps [databases](https://github.com/encode/databases) from 0.5.5 to 0.6.0.
- [Release notes](https://github.com/encode/databases/releases)
- [Changelog](https://github.com/encode/databases/blob/master/CHANGELOG.md)
- [Commits](https://github.com/encode/databases/compare/0.5.5...0.6.0)

---
updated-dependencies:
- dependency-name: databases
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pyproject.toml

@@ -42,7 +42,7 @@ classifiers = [
 
 [tool.poetry.dependencies]
 python = "^3.7.0"
-databases = ">=0.3.2,!=0.5.0,!=0.5.1,!=0.5.2,!=0.5.3,<=0.5.5"
+databases = ">=0.3.2,!=0.5.0,!=0.5.1,!=0.5.2,!=0.5.3,<0.6.1"
 pydantic = ">=1.6.1,!=1.7,!=1.7.1,!=1.7.2,!=1.7.3,!=1.8,!=1.8.1,<=1.9.1"
 SQLAlchemy = ">=1.3.18,<1.4.37"
 asyncpg = { version = ">=0.24,<0.26", optional = true }