backport of commit e65d295c88 (#20905)

Co-authored-by: Max Bowsher <maxbowsher@gmail.com>

changelog/20881.txt

@@ -0,0 +1,3 @@
+```release-note:improvement
+sdk/framework: Fix non-deterministic ordering of 'required' fields in OpenAPI spec
+```

sdk/framework/openapi.go

@@ -373,6 +373,10 @@ func documentPath(p *Path, specialPaths *logical.Paths, requestResponsePrefix st
 					s.Properties[name] = &p
 				}
 
+				// Make the ordering deterministic, so that the generated OpenAPI spec document, observed over several
+				// versions, doesn't contain spurious non-semantic changes.
+				sort.Strings(s.Required)
+
 				// If examples were given, use the first one as the sample
 				// of this schema.
 				if len(props.Examples) > 0 {