chore: update default theme to 1.7.1 (#4961)

#### What type of PR is this?

/area core
/milestone 2.11.0

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

更新默认主题至 https://github.com/halo-dev/theme-earth/releases/tag/v1.7.1

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

```release-note
更新默认主题至 1.7.1
```
pull/4958/head
Ryan Wang 2023-12-01 10:10:09 +08:00 committed by GitHub
parent cf3c248b41
commit 90e45b0091
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