fix: bigint literal value cannot be null

Author: marvinhagemeister

cli/tsc/dts/lib.deno.unstable.d.ts

@@ -2573,7 +2573,7 @@ declare namespace Deno {
       type: "Literal";
       raw: string;
       bigint: string;
-      value: bigint | null;
+      value: bigint;
     }
 
     /**