Pin 'rich' as ansible-lint crashes otherwise

Change-Id: I2ae9923815aa07dbb6e1469c7108ad296cc6d8c1
diff --git a/requirements.txt b/requirements.txt
index 5cc6ea1..7a5ea87 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,3 +21,4 @@
 yamllint~=1.26.0
 zxcvbn~=4.4.28
 python-debian==0.1.40
+rich~=10.16.2