Allow use of higher versions of saml2

The package was pinned to <4.0 with 07cf96eb because "from saml2 import
config" did not work. This seems to have been fixed in the mean time in the
saml2 package and therefore should not stop to use a more recent version.

Signed-off-by: Oliver Kurz <okurz@suse.de>

synapse/python_dependencies.py

@@ -36,7 +36,7 @@ REQUIREMENTS = {
     "pydenticon": ["pydenticon"],
     "ujson": ["ujson"],
     "blist": ["blist"],
-    "pysaml2>=3.0.0,<4.0.0": ["saml2>=3.0.0,<4.0.0"],
+    "pysaml2>=3.0.0": ["saml2>=3.0.0"],
     "pymacaroons-pynacl": ["pymacaroons"],
     "msgpack-python>=0.3.0": ["msgpack"],
     "phonenumbers>=8.2.0": ["phonenumbers"],