Avoid https://github.com/nektos/act/issues/1908 by specifying golang 1.20.5. (#295)

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Without this, actions fail when attempting to clone the repo:

```
2023-07-18 17:11:02 [Smoke Test/Run basic test suite] failed to attach to exec: http: invalid Host header
```

This appears to be the same as https://github.com/nektos/act/issues/1908, and only shows up with golang 1.20.6.  Staying with golang 1.20.5 is a temporary solution to avoid the bug until it is fixed upstream.

Reviewed-on: https://gitea.com/gitea/act_runner/pulls/295
Co-authored-by: Thomas E Lackey <telackey@bozemanpass.com>
Co-committed-by: Thomas E Lackey <telackey@bozemanpass.com>

This commit was merged in pull request #295.

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