Update pytest to latest

Signed-off-by: Sreekanth <prsreekanth920@gmail.com>

Author: BulkBeing

packages/pynumaflow/pyproject.toml

@@ -38,7 +38,7 @@ Repository = "https://github.com/numaproj/numaflow-python"
 
 [dependency-groups]
 dev = [
-    "pytest>=7.2.1",
+    "pytest>=9.0.2",
     "pytest-cov>=3.0",
     "black>=23.1",
     "grpcio-testing>=1.48.1",