OpenAPI Update (#943)

Update OpenAPI for facd67810264e98863a385e442b8d37d61a37bf3

Co-authored-by: Stripe OpenAPI <105521251+stripe-openapi[bot]@users.noreply.github.com>

Author: stripe-openapi[bot]

embedded/openapi/spec3.beta.sdk.json

@@ -2523,6 +2523,7 @@
               "invalid_cvc",
               "invalid_expiry_month",
               "invalid_expiry_year",
+              "invalid_mandate_reference_prefix_format",
               "invalid_number",
               "invalid_source_usage",
               "invalid_tax_location",