fix tests for new FY (#3030)

Co-authored-by: Carolyn <carolyn.barker@softwire.com>
Co-authored-by: Manny Dinssa <44172848+Dinssa@users.noreply.github.com>

spec/models/sales_log_spec.rb

@@ -104,6 +104,7 @@ 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