chore: bump default theme version to 1.6.0 (#4700)

#### What type of PR is this?

/area core
/kind improvement
/milestone 2.10.x

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

升级默认主题 Earth 的版本至 [1.6.0](https://github.com/halo-dev/theme-earth/releases/tag/v1.6.0)


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

```release-note
None
```
pull/4703/head
Ryan Wang 2023-10-10 11:44:28 +08:00 committed by GitHub
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commit d97c1e6e3d
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