Montana State Tax Code Updates for 2024

Fixes PolicyEngine#5763

Author: daphnehanse11

policyengine_us/parameters/gov/states/mt/tax/income/exemptions/applies.yaml

@@ -8,6 +8,10 @@ metadata:
       href: https://mtrevenue.gov/montana-tax-simplification-resource-hub/#1
     - title: Montana State Senate Bill 399 (2021)
       href: https://archive.legmt.gov/bills/2021/sesslaws/ch0503.pdf#page=31
+    - title: 2024 Montana Individual Income Tax Return (line 2)
+      href: https://revenuefiles.mt.gov/files/Forms/Montana-Individual-Income-Tax-Return-Form-2/2024_Montana_Individual_Income_Tax_Return_Form_2.pdf
+    - title: 2023 Montana Individual Income Tax Return: Exemptions
+      href: https://revenuefiles.mt.gov/files/Forms/Montana-Individual-Income-Tax-Return-Form-2/2023_Montana_Individual_Income_Tax_Return_Form_2.pdf
   label: Montana income tax exemptions applies 
   period: year
   unit: bool