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GH-35133: [Go] fix for `math.MaxUint32 overflows int` error in 32-bit arch (#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: #35133

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