apacheGH-35133: [Go] fix for math.MaxUint32 overflows int error in …

…32-bit arch (apache#35159)

### Rationale for this change

When compiling on i386 arch, an error like `math.MaxUint32 (untyped int constant 4294967295) overflows int` will appear. The Int type is 32-bit and in 32-bit arch it overflows. In my PR, I cast `int` to `unint` to avoid this error.

* Closes: apache#35133

Authored-by: sunpeng <sunpeng.dev@gmail.com>
Signed-off-by: Matt Topol <zotthewizard@gmail.com>

go/arrow/array/dictionary.go

@@ -1561,7 +1561,7 @@ func (u *unifier) GetResultWithIndexType(indexType arrow.DataType) (arrow.Array,
 	case arrow.INT16:
 		toobig = dictLen > math.MaxInt16
 	case arrow.UINT32:
-		toobig = dictLen > math.MaxUint32
+		toobig = uint(dictLen) > math.MaxUint32
 	case arrow.INT32:
 		toobig = dictLen > math.MaxInt32
 	case arrow.UINT64: