Fix installing pysaml2 on Python 3.5. (#8898)

This pins pysaml2 to < 6.4.0 on Python 3.5, as the last known working version.
matrix-org · Dec 9, 2020 · 0eb9b2f · 0eb9b2f
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diff --git a/changelog.d/8898.misc b/changelog.d/8898.misc
@@ -0,0 +1 @@
+Add a maximum version for pysaml2 on Python 3.5.
diff --git a/synapse/python_dependencies.py b/synapse/python_dependencies.py
@@ -99,7 +99,11 @@
         # python 3.5.2, as per https://github.com/itamarst/eliot/issues/418
         'eliot<1.8.0;python_version<"3.5.3"',
     ],
-    "saml2": ["pysaml2>=4.5.0"],
+    "saml2": [
+        # pysaml2 6.4.0 is incompatible with Python 3.5 (see https://github.com/IdentityPython/pysaml2/issues/749)
+        "pysaml2>=4.5.0,<6.4.0;python_version<'3.6'",
+        "pysaml2>=4.5.0;python_version>='3.6'",
+    ],
     "oidc": ["authlib>=0.14.0"],
     "systemd": ["systemd-python>=231"],
     "url_preview": ["lxml>=3.5.0"],
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		Add a maximum version for pysaml2 on Python 3.5.