[Misdetection] ASCII-armored GPG key file misdetected as PEM certificate

**What should the file have been detected as? What has the file been misdetected as?**
Should be something like "ASCII-armored GPG file".

This was the output:
```
$ magika mullvad-code-signing.asc
mullvad-code-signing.asc: PEM certificate (application)
```

**Please link or attach the misdetected file below** (Do NOT upload PII!)
https://mullvad.net/media/mullvad-code-signing.asc

**Additional context**

Download the linked mullvad-code-signing.asc file and reproduce the result with the magika command shown in the issue. Trace the classification path for this sample and adjust the relevant detection behavior so it is identified as an ASCII-armored GPG file rather than a PEM certificate, then rerun the command to verify the output.

Written by the indexing model from the issue text.