Bump asyncpg from 0.29.0 to 0.30.0 (#1230)

Bumps [asyncpg](https://github.com/MagicStack/asyncpg) from 0.29.0 to 0.30.0.
- [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
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

demos/blog/requirements.txt

@@ -1,7 +1,7 @@
 aiohttp==3.8.6
 aiohttp-jinja2==1.5.1
 aiohttp_security[session]==0.4.0
-asyncpg==0.29.0
+asyncpg==0.30.0
 asyncpgsa==0.27.1
 bcrypt==4.1.3
 pytoml==0.1.21