Upgrade to waitress 3.x

src/promptflow-devkit/pyproject.toml

@@ -56,7 +56,7 @@ filelock = ">=3.4.0,<4.0.0"  # control plane sdk requirements, to lock for multi
 marshmallow = ">=3.5,<4.0.0"
 gitpython = ">=3.1.24,<4.0.0"  # used git info to generate flow id
 strictyaml = ">=1.5.0,<2.0.0"  # used to identify exact location of validation error
-waitress = ">=2.1.2,<3.0.0"  # used to serve local service
+waitress = ">=3.0.0,<4.0.0"  # used to serve local service
 azure-monitor-opentelemetry-exporter = ">=1.0.0b21,<2.0.0"
 pyarrow = { version = ">=14.0.1,<15.0.0", optional = true }  # used to read parquet file with pandas.read_parquet
 pillow = ">=10.1.0,<11.0.0"  # used to generate icon data URI for package tool