[mlir][test] Fix -Wformat in sparse_tensor.c (NFC)

llvm-project/mlir/test/CAPI/sparse_tensor.c:50:42:
error: format specifies type 'unsigned long' but the argument has type 'MlirSparseTensorLevelType' (aka 'unsigned long long') [-Werror,-Wformat]
   50 |     fprintf(stderr, "level_type: %lu\n", lvlTypes[l]);
      |                                  ~~~     ^~~~~~~~~~~
      |                                  %llu
1 error generated.

Author: DamonFool

mlir/test/CAPI/sparse_tensor.c

@@ -47,7 +47,7 @@ static int testRoundtripEncoding(MlirContext ctx) {
       malloc(sizeof(MlirSparseTensorLevelType) * lvlRank);
   for (int l = 0; l < lvlRank; ++l) {
     lvlTypes[l] = mlirSparseTensorEncodingAttrGetLvlType(originalAttr, l);
-    fprintf(stderr, "level_type: %lu\n", lvlTypes[l]);
+    fprintf(stderr, "level_type: %llu\n", lvlTypes[l]);
   }
   // CHECK: posWidth: 32
   int posWidth = mlirSparseTensorEncodingAttrGetPosWidth(originalAttr);