fix tests for new FY

spec/models/sales_log_spec.rb

@@ -102,6 +102,7 @@ RSpec.describe SalesLog, type: :model do
 
     after do
       Timecop.return
+      Singleton.__init__(FormHandler)
     end
 
     it "has returns the correct form based on the start date" do

spec/requests/form_controller_spec.rb

@@ -1675,10 +1675,12 @@ RSpec.describe FormController, type: :request do
         context "and changing an answer" do
           before do
             Timecop.freeze(2024, 5, 6)
+            Singleton.__init__(FormHandler)
           end
 
           after do
             Timecop.return
+            Singleton.__init__(FormHandler)
           end
 
           it "navigates to follow-up questions when required" do