fix: FormKit code input type error

[ruibaby]

What type of PR is this?

/area ui
/kind bug
/milestone 2.14.0

What this PR does / why we need it:

修复 FormKit 中 code 输入框的类型异常，在此之前如果这样使用：

<FormKit type="code" v-model="text" />

那么 v-model 的类型会不正确。以前忽略了此问题的原因是在之前 code 类型的输入框没有以组件的形式使用过，系统中都是使用 FormKit Schema 调用的。

Does this PR introduce a user-facing change?

None

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[JohnNiang]

Good catch!

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnNiang

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• ui/OWNERS [JohnNiang]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.56%. Comparing base (5fdf6c0) to head (bfaa0fb).
Report is 64 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5522      +/-   ##
============================================
- Coverage     56.91%   56.56%   -0.35%     
+ Complexity     3319     3310       -9     
============================================
  Files           587      592       +5     
  Lines         18968    19178     +210     
  Branches       1401     1355      -46     
============================================
+ Hits          10795    10848      +53     
- Misses         7594     7769     +175     
+ Partials        579      561      -18     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[guqing]

/lgtm