Update dependency pytest to v9

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

poetry.lock

@@ -39,7 +39,7 @@ cryptography = "^42.0.8 || ^43.0.0 || ^44.0.0 || ^45.0.0"
 pyside6-essentials = "^6.7.2"
 
 [tool.poetry.group.dev.dependencies]
-pytest = "^7.1.3 || ^8.0.0"
+pytest = "^7.1.3 || ^8.0.0 || ^9.0.0"
 pytest-cov = "^4.1.0 || ^5.0.0 || ^6.0.0"
 ruff = "^0.2.0 || ^0.3.0 || ^0.6.0 || ^0.7.0 || ^0.8.0 || ^0.9.0 || ^0.10.0 || ^0.11.0 || ^0.12.0 || ^0.13.0"
 tox = "^4.0.0"