fix assert.NotNil not working

[ElvisWai]

Describe the bug

使用 assert 的 NotNil 断言时不生效

Replay 测试代码：

import  "github.com/cloudwego/hertz/pkg/common/test/assert"
func TestAssertNotNil(t *testing.T) {
    var test interface{}
    assert.NotNil(t, test)
    fmt.Println("test 值不为空")
}

Hertz version:

version: 0.9.2

[github-actions[bot]]

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