Bump BWC version to 7.1 after backport

Relates to elastic#39698

Author: s1monw

rest-api-spec/src/main/resources/rest-api-spec/test/indices.stats/30_segments.yml

@@ -16,7 +16,7 @@ setup:
 "Segment Stats":
 
   - skip:
-      version: " - 7.99.99"
+      version: " - 7.0.99"
       reason: forbid_closed_indices is not supported in ealier version
 
   - do: