[INFRA] Update .travis.yml

[eseiler]

Jammy for now is only available for amd64 on the Travis CI platform.

Supersedes #3122, because I can't push.

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Name	Status	Preview	Comments	Updated
seqan3	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Feb 17, 2023 at 11:43AM (UTC)

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@4f662c3). Click here to learn what that means. Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3135 +/- ## ========================================= Coverage ? 98.18% ========================================= Files ? 276 Lines ? 12292 Branches ? 0 ========================================= Hits ? 12069 Misses ? 223 Partials ? 0 ``` Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan)

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