Bump centos from 7 to 8 in /src/main/resources/ath-container

[dependabot[bot]]

Bumps centos from 7 to 8.

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[NotMyFault]

@dependabot rebase

[NotMyFault]

Needs fix and I'm not sure that this is really an upgrade as 8 goes out of support a lot quicker than 7

8 is already EOL afaik. 7 gets maintanance updates til '24

[timja]

right yeah.

should prob just switch to ubuntu like the rest of jenkins-infra is ?

[NotMyFault]

That would make sense, the 22.04 upgrade campaign is ongoing still iirc.

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