update linter ruleset

dev/tykapi-auth-ruleset.yaml

@@ -1,13 +1,15 @@
-extends: 'spectral:oas'
-
 rules:
   check-authentication-methods:
     description: "At least one of 'enable_jwt' or 'use_mutual_tls_auth' must be true."
     given: "$.api_definition"
     then:
-      - field: 'enable_jwt'
+      - field: "enable_jwt"
         function: truthy
-      - field: 'use_mutual_tls_auth'
+        functionOptions:
+          negation: true # Should not be false
+      - field: "use_mutual_tls_auth"
         function: truthy
+        functionOptions:
+          negation: true # Should not be false
     severity: error
-    message: "At least one of 'api_definition.enable_jwt' or 'api_definition.use_mutual_tls_auth' must be true."
+    message: "At least one of 'api_definition.enable_jwt' or 'api_definition.use_mutual_tls_auth' must be true."

dev/tykapi-ruleset.yaml

@@ -1,5 +1,3 @@
-extends: 'spectral:oas'
-
 rules:
   no-keyless-auth:
     description: APIs must not be keyless