SPO ratification takes less epochs than expected

[carlostome]

The last part of test StakePool/Rewards contribute to active voting stake even in the absence of StakeDistr reads as follows:

            -- The same vote should now successfully ratify the proposal
            -- NOTE: It takes 2 epochs for SPO votes as opposed to 1 epoch
            -- for DRep votes to ratify a proposal.
            passNEpochs 2
            getLastEnactedCommittee `shouldReturn` SJust (GovPurposeId addCCGaid)

Transforming the note into testable conditions:

diff --git a/eras/conway/impl/testlib/Test/Cardano/Ledger/Conway/Imp/RatifySpec.hs b/eras/conway/impl/testlib/Test/Cardano/Ledger/Conway/Imp/RatifySpec.hs
index 40de5fb30..9dd7c5981 100644
--- a/eras/conway/impl/testlib/Test/Cardano/Ledger/Conway/Imp/RatifySpec.hs
+++ b/eras/conway/impl/testlib/Test/Cardano/Ledger/Conway/Imp/RatifySpec.hs
@@ -1069,7 +1069,11 @@ votingSpec =
             -- The same vote should now successfully ratify the proposal
             -- NOTE: It takes 2 epochs for SPO votes as opposed to 1 epoch
             -- for DRep votes to ratify a proposal.
-            passNEpochs 2
+            passNEpochs 1
+            isSpoAccepted addCCGaid `shouldReturn` False
+            getLastEnactedCommittee `shouldReturn` SNothing
+            passNEpochs 1
+            isSpoAccepted addCCGaid `shouldReturn` True
             getLastEnactedCommittee `shouldReturn` SJust (GovPurposeId addCCGaid)
         describe "Proposal deposits contribute to active voting stake" $ do
           it "Directly" $ whenPostBootstrap $ do

makes the test fail for protocol versions 10 and 11.