pin sniffio<1.3.1

wheelhouse.txt

@@ -32,10 +32,13 @@ setuptools-scm<=1.17.0;python_version < '3.8'
 setuptools-scm<7;python_version >= '3.8'
 flit_core<4.0.0;python_version >= '3.8'
 flit_scm<=1.7.0;python_version >= '3.8'
-anyio<3.7.0;python_version >= '3.8'
 charmhelpers>=0.4.0,<2.0.0
 charms.reactive>=0.1.0,<2.0.0
 wheel<0.34;python_version < '3.8'
 wheel<1.0;python_version >= '3.8'
 # pin netaddr to avoid pulling importlib-resources
 netaddr<=0.7.19
+
+# https://github.com/python-trio/sniffio/pull/49
+anyio<3.7.0;python_version >= '3.8'
+sniffio<1.3.1  # 1.3.1 requires setuptools>=64