setup: fix colorama upper pin (#6158) [skip ci]

Author: oliver-sanders

setup.cfg

@@ -64,7 +64,7 @@ python_requires = >=3.7
 install_requires =
     ansimarkup>=1.0.0
     async-timeout>=3.0.0
-    colorama>=0.4,<=1
+    colorama>=0.4,<1
     graphene>=2.1,<3
     # Note: can't pin jinja2 any higher than this until we give up on Cylc 7 back-compat
     jinja2==3.0.*