Fix tests

Author: hamishmack

lib/call-cabal-project-to-nix.nix

@@ -151,7 +151,7 @@ in let
       let
         suitable-index-states =
           builtins.filter
-            (s: s >= index-state-max) # This compare is why we need zulu time
+            (s: s > index-state-max) # This compare is why we need zulu time
             (builtins.attrNames index-state-hashes);
       in
         if builtins.length suitable-index-states == 0