Update dependency pytest to v9 [SECURITY]

Author: renovate[bot]

poetry.lock

@@ -81,14 +81,14 @@ ops = "^2.23.0"
 optional = true
 
 [tool.poetry.group.unit.dependencies]
-pytest = "^8.4.1"
+pytest = "^9.0.0"
 coverage = { extras = ["toml"], version = "^7.9.1" }
 pytest-mock = "^3.14.1"
 pyyaml = "^6.0.2"
 responses = "^0.25.7"
 
 [tool.poetry.group.integration.dependencies]
-pytest = "^8.4.1"
+pytest = "^9.0.0"
 juju = "^3.6.1.3"
 tenacity = "^9.1.2"
 coverage = { extras = ["toml"], version = "^7.9.1" }