fix(Slider): precision problem

[pany-ang]

修复 issue: #13718 提到的问题

---

该 PR 没有提供单测，因为不知为何原因，以下想新增的单测始终过不了

test('should have precision', async () => {
  const wrapper = mount(Slider, {
    props: {
      max: 1000000,
      step: 0.01,
      modelValue: 300000.03,
    },
  });

  await later();
  expect(wrapper.emitted('update:modelValue')![0]).toEqual([300000.03]);
});

显示 wrapper.emitted('update:modelValue') 始终为 undefined

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.96%. Comparing base (ec5b45b) to head (32399a3).
⚠️ Report is 255 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13720      +/-   ##
==========================================
+ Coverage   89.60%   89.96%   +0.35%     
==========================================
  Files         257      257              
  Lines        7013     7052      +39     
  Branches     1736     1748      +12     
==========================================
+ Hits         6284     6344      +60     
+ Misses        384      372      -12     
+ Partials      345      336       -9     

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