setup.py: Install django and starlette extra with testing extra

setup.py

@@ -53,7 +53,7 @@ setup(
     extras_require={
         "django": parse_requirements("django"),
         "starlette": parse_requirements("starlette"),
-        "testing": parse_requirements("test"),
+        "testing": parse_requirements("test", "django", "starlette"),
     },
     include_package_data=True,
     entry_points="""

tox.ini

@@ -48,9 +48,7 @@ commands =
 allowlist_externals = make
 usedevelop = true
 extras =
-  django
   testing
-  starlette
 deps =
   # fetch and install swh-docs in develop mode
   -e git+https://gitlab.softwareheritage.org/swh/devel/swh-docs.git\#egg=swh.docs
@@ -67,9 +65,7 @@ commands =
 allowlist_externals = make
 usedevelop = true
 extras =
-  django
   testing
-  starlette
 deps =
   # install swh-docs in develop mode
   -e ../swh-docs