Change IGNORED_TESTS variable to native sets to be RF 6.1.1 compatible

Author: robinmackaij

tests/driver/suites/load_json.robot

@@ -9,9 +9,9 @@ Test Template       Do Nothing
 
 *** Variables ***
 @{IGNORED_RESPONSES}=       200    404    400
-@{IGNORE_POST_PET}=         /pet    POST    405
-@{IGNORE_POST_PET_ID}=      /pet/{petId}    post    405
-@{IGNORE_POST_ORDER}=       /store/order    post    405
+${IGNORE_POST_PET}=         ${{("/pet", "POST", 405)}}
+${IGNORE_POST_PET_ID}=      ${{("/pet/{petId}", "post", 405)}}
+${IGNORE_POST_ORDER}=       ${{("/store/order", "post", 405)}}
 @{IGNORED_TESTS}=           ${IGNORE_POST_PET}    ${IGNORE_POST_PET_ID}    ${IGNORE_POST_ORDER}