Lower log level about invalid session token

[zero0cool0]

• Resolves: [Bug]: OC\Authentication\Exceptions\InvalidTokenException: Token is too short for a generated token, should be the password during basic auth #41156

Summary

Lower log level severity as suggested by @ChristophWurst

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[RainerEmrich]

/backport to stable27

[welcome]

Thanks for your first pull request and welcome to the community! Feel free to keep them coming! If you are looking for issues to tackle then have a look at this selection: https://github.com/nextcloud/server/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22

[DanScharon]

can we also get a backport for 26?

[AndyScherzinger]

/backport to stable26

[AndyScherzinger]

can we also get a backport for 26?

Let's see if the backport can be auto-generated