#3899 typescript fix

Author: cielbellerose

src/shared/src/types/finance-types.ts

@@ -10,7 +10,7 @@ export interface Sponsor {
   activeYears: number[];
   taxExempt: boolean;
   discountCode?: string;
-  sponsorNotes: string;
+  sponsorNotes?: string;
   sponsorTasks: SponsorTask[];
   tier: SponsorTier;
 }