change "tests:" to "data_tests:"

models/staging/xedotcom/schema.yml

@@ -13,18 +13,18 @@ models:
         description: A unique ID for the record, derived from concatenating the
           currencies and date. Currency order is relevant (EURUSD != USDEUR).
         data_type: text
-        tests:
+        data_tests:
           - not_null
           - unique
       - name: from_currency
         description: The source currency, represented as an ISO 4217 code.
         data_type: character
-        tests:
+        data_tests:
           - not_null
       - name: to_currency
         description: The target currency, represented as an ISO 4217 code.
         data_type: character
-        tests:
+        data_tests:
           - not_null
       - name: rate
         description: >-
@@ -38,7 +38,7 @@ models:
 
           The rate can be smaller than one, but can't be negative.
         data_type: numeric
-        tests:
+        data_tests:
           - not_negative_or_zero
           - not_null
       - name: rate_date_utc