#### What type of PR is this?
/kind cleanup
#### What this PR does / why we need it:
Not long ago, we announced the cessation of maintenance for 1.x at <https://www.halo.run/archives/halo-1.x-eol>. So we also need to to synchronize changes to security policies.
#### Does this PR introduce a user-facing change?
```release-note
None
```
#### What type of PR is this?
/kind documentation
#### What this PR does / why we need it:
更新 SECURITY.md 文档中支持的版本。
#### Does this PR introduce a user-facing change?
```release-note
None
```
John Niang