fix(firestore-stripe-invoices): updated external services to correct pricing uri configuration (#360)

Author: dackers86

firestore-stripe-invoices/extension.yaml

@@ -40,7 +40,7 @@ billingRequired: true # this extension makes requests to a third party API (Stri
 
 externalServices:
   - name: Stripe
-  - pricingUri: https://stripe.com/pricing
+    pricingUri: https://stripe.com/pricing
 
 roles:
   - role: firebaseauth.viewer