Update asyncpg requirement from ^0.25.0 to >=0.25,<0.27 (#69)

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@v0.25.0...v0.26.0)

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

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

Author: dependabot[bot]

pyproject.toml

@@ -16,7 +16,7 @@ keywords = ["postgres", "postgresql", "asyncpg", "asyncio", "orm"]
 
 [tool.poetry.dependencies]
 python = "^3.8"
-asyncpg = "^0.25.0"
+asyncpg = ">=0.25,<0.27"
 pydantic = "^1.9.0"
 
 [tool.poetry.dev-dependencies]