depend(deps): update asyncpg requirement (#623)

Updates the requirements on [asyncpg](https://github.com/MagicStack/asyncpg) to permit the latest version.
- [Release notes](https://github.com/MagicStack/asyncpg/releases)
- [Commits](MagicStack/asyncpg@v0.29.0...v0.30.0)

---
updated-dependencies:
- dependency-name: asyncpg
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements/sql.txt

@@ -1,5 +1,5 @@
 sqlalchemy[asyncio]>=2.0,<3.0
 aiosqlite>=0.19,<0.21
 pymssql>=2.2,<2.4
-asyncpg>=0.29,<0.30
+asyncpg>=0.29,<0.31
 asyncmy>=0.2,<0.3