chore: update default theme version to 1.9.0 (#6516)

#### What type of PR is this?

/area core
/kind feature
/milestone 2.19.x

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

升级默认主题的版本为 [1.9.0](https://github.com/halo-dev/theme-earth/releases/tag/v1.9.0)。

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

```release-note
None
```
pull/6526/head
Ryan Wang 2024-08-26 16:11:13 +08:00 committed by GitHub
parent 72e7b19697
commit d77c258951
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