CI: autoupdate: update access token bot email

The project access token disappeared (maybe expired?), let's avoid hardcoding this and put it in a CI variable instead.

The CI variables have been documented on the wiki here: https://wiki.postmarketos.org/wiki/Pmaports.git

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approved this merge request

added 3 commits

• d0f9c273...f5d4bef1 - 2 commits from branch master
• 0b78805c - CI: autoupdate: update access token bot email (MR 5834)

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enabled an automatic merge when all merge checks for 0b78805c pass

merged