fix_typescript_error

Author: amaannawab923

superset-frontend/plugins/plugin-chart-ag-grid-table/src/stateConversion.ts

@@ -58,7 +58,7 @@ const DATE_FILTER_OPERATOR_MAP: Record<string, string> = {
 /**
  * Blank filter operator types
  */
-const BLANK_OPERATORS = new Set([
+const BLANK_OPERATORS: Set<string> = new Set([
   FILTER_OPERATORS.BLANK,
   FILTER_OPERATORS.NOT_BLANK,
   FILTER_OPERATORS.SERVER_BLANK,