chore: refactor date library usage to use CodegenConstants.DATE_LIBRARY#12695

ChihweiLHBird wants to merge 1 commit intoswagger-api:masterswagger-api/swagger-codegen:masterfrom

ChihweiLHBird:move-date-lib-constant-to-shared-fileChihweiLHBird/swagger-codegen:move-date-lib-constant-to-shared-fileCopy head branch name to clipboard