Unpin attrs dep after new version has been released (#9946)

erikjohnston · web-flow · commit 4df26abf28a1 · 2021-05-07T12:57:21.000+01:00
c.f. #9936
diff --git a/changelog.d/9946.misc b/changelog.d/9946.misc
@@ -0,0 +1 @@
+Unpin attrs dependency.
diff --git a/synapse/python_dependencies.py b/synapse/python_dependencies.py
@@ -79,7 +79,7 @@
     # Fedora 31 only has 19.1, so if we want to upgrade we should wait until 33
     # is out in November.)
     # Note: 21.1.0 broke `/sync`, see #9936
-    "attrs>=19.1.0,<21.1.0",
+    "attrs>=19.1.0,!=21.1.0",
     "netaddr>=0.7.18",
     "Jinja2>=2.9",
     "bleach>=1.4.3",
