[PIP] Update pytest requirement from <8.5,>=7.0.0 to >=7.0.0,<9.1

Updates the requirements on [pytest](https://github.com/pytest-dev/pytest) to permit the latest version.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@7.0.0...9.0.1)

---
updated-dependencies:
- dependency-name: pytest
  dependency-version: 9.0.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

test_requirements.txt

@@ -1,5 +1,5 @@
 # Test requirements
-pytest>=7.0.0,<8.5
+pytest>=7.0.0,<9.1
 pytest-subtests>=0.12.0,<0.16
 python-gnupg>=0.5.0,<0.6
 trustme>=1.1.0,<1.3