chore(deps): update dependency pytest to v9

Author: renovate[bot]

pact-python-cli/pyproject.toml

@@ -52,7 +52,7 @@ requires-python = ">=3.10"
 # Linting and formatting tools use a more narrow specification to ensure
 # developper consistency. All other dependencies are as above.
 dev   = ["ruff==0.14.3", { include-group = "test" }, { include-group = "types" }]
-test  = ["pytest-cov~=7.0", "pytest~=8.0"]
+test  = ["pytest-cov~=7.0", "pytest~=9.0"]
 types = ["mypy==1.18.2"]
 
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