compat: Restore Graphene 2 support

Fix the dependency in `pyproject.toml` and add a test parameter for the
Graphene 2.x case.

Author: Rami Chowdhury

noxfile.py

@@ -7,10 +7,15 @@
     "pydantic",
     ("1.9", "1.10", "1.7", "1.8"),
 )
-def tests(session, pydantic):
+@parametrize("graphene", ("2.1.9", "3"))
+def tests(session, pydantic, graphene):
     if sys.version_info > (3, 10) and pydantic in ("1.7", "1.8"):
         return session.skip()
+    if sys.version_info > (3, 10) and graphene != "3":
+        # Graphene 2.x doesn't support Python 3.11
+        return session.skip()
     session.install(f"pydantic=={pydantic}")
+    session.install(f"graphene=={graphene}")
     session.install("pytest", "pytest-cov", ".")
     session.run(
         "pytest", "-v", "tests/", "--cov-report=term-missing", "--cov=graphene_pydantic"

pyproject.toml

@@ -25,7 +25,7 @@ keywords = ["api", "graphql", "protocol", "rest", "relay", "graphene", "pydantic
 
 [tool.poetry.dependencies]
 python = "^3.7"
-graphene = ">=3.0"
+graphene = ">=2.1.8"
 pydantic = [
     { version = ">=1.0,<2.0", python = ">3.6,<3.12" },
     { version = ">=1.9,<2.0", python = ">=3.10" }