Bump asyncpg from 0.22.0 to 0.27.0

Bumps [asyncpg](https://github.com/MagicStack/asyncpg) from 0.22.0 to 0.27.0.
- [Release notes](https://github.com/MagicStack/asyncpg/releases)
- [Commits](MagicStack/asyncpg@v0.22.0...v0.27.0)

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

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

Author: dependabot[bot]

requirements.txt

@@ -1,6 +1,6 @@
 aiofiles==0.6.0; python_full_version >= "3.7.0" and python_version >= "3.7"
 aiosqlite==0.16.1; python_version >= "3.7" and python_version < "4.0"
-asyncpg==0.22.0; python_full_version >= "3.5.0"
+asyncpg==0.27.0; python_full_version >= "3.5.0"
 beautifulsoup4==4.9.3
 blinker==1.4; python_full_version >= "3.7.0" and python_version >= "3.7"
 brotli==1.0.9