fix failing tests

Author: dsa0x

internal/cloud/testdata/query-json-basic/main.tfquery.hcl

@@ -1 +1,3 @@
-list "concept_pet" "pets" {}
+list "concept_pet" "pets" {
+  provider = concept
+}

internal/cloud/testdata/query/main.tfquery.hcl

@@ -1 +1,3 @@
-list "null_resource" "foo" {}
+list "null_resource" "foo" {
+  provider = null
+}