chore: update default theme to 1.4.0 (#4019)

#### What type of PR is this?

/kind improvement
/area core
/milestone 2.6.x

#### What this PR does / why we need it:

更新默认主题至 1.4.0

#### Does this PR introduce a user-facing change?

```release-note
None
```
pull/4026/head
Ryan Wang 2023-06-01 11:02:15 +08:00 committed by GitHub
parent ede8ea4827
commit 51816776ba
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