chore: update default theme package (#3051)

#### What type of PR is this?

/kind improvement

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

更新默认主题。 https://github.com/halo-dev/theme-earth/releases/tag/v1.1.0

#### Which issue(s) this PR fixes:

Fixes #3045

#### Special notes for your reviewer:

None

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

```release-note
更新默认主题的版本
```