chore: bump default theme version to 1.2.1 (#3607)

#### What type of PR is this?

/kind improvement

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

升级默认主题的版本为 1.2.1:https://github.com/halo-dev/theme-earth/releases/tag/v1.2.1

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

```release-note
None
```
pull/3610/head
Ryan Wang 2023-03-28 22:52:12 +08:00 committed by GitHub
parent bd4cc0c72d
commit e5253cf6eb
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