Update pytest-asyncio requirement from <0.24 to <0.26

Updates the requirements on [pytest-asyncio](https://github.com/pytest-dev/pytest-asyncio) to permit the latest version.
- [Release notes](https://github.com/pytest-dev/pytest-asyncio/releases)
- [Commits](pytest-dev/pytest-asyncio@v0.1.1...v0.25.2)

---
updated-dependencies:
- dependency-name: pytest-asyncio
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements/constraints.txt

@@ -38,7 +38,7 @@ sqlalchemy<2.0
 
 # SEE https://github.com/pytest-dev/pytest-asyncio/issues/706
 # Many tests fail with `RuntimeError: There is no current event loop in thread 'MainThread'`
-pytest-asyncio<0.24
+pytest-asyncio<0.26
 
 #
 # Bugs