Mark the security policy for version 1.x as unsupported (#5450)

#### 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
```
This commit is contained in:
John Niang 2024-03-06 14:06:07 +08:00 committed by GitHub
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commit 860f694385
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@ -11,7 +11,7 @@ Halo currently supports the versions listed below, where as:
| Version | Supported |
| ------- | ------------------ |
| 0.x | :x: |
| 1.x | :white_check_mark: |
| 1.x | :x: |
| 2.x | :white_check_mark: |
## Reporting a Vulnerability