Temporarily lock deepdiff version to fix CI failures (#282)

Temporarily lock deepdiff version to fix CI failures

Reviewed-by: Maja Massarini

Author: softwarefactory-project-zuul[bot]

plans/packit-integration.fmf

@@ -24,7 +24,9 @@ adjust:
       - how: install
         package: python3-pip
       - how: shell
-        script: pip3 install flexmock deepdiff
+        # the version lock on deepdiff can be removed once this is resolved:
+        # https://github.com/seperman/deepdiff/issues/416
+        script: pip3 install flexmock deepdiff==6.3.1
 
   - when: "distro == rhel-8 or distro == centos-8 or distro == centos-stream-8"
     because: "packit doesn't support EL 8"