[stable27] ci(xmllint): bump action to v1.1

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (stable27@13e1e6b). Click here to learn what that means. Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## stable27 #1429 +/- ## =========================================== Coverage ? 44.29% Complexity ? 99 =========================================== Files ? 19 Lines ? 298 Branches ? 0 =========================================== Hits ? 132 Misses ? 166 Partials ? 0 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `44.29% <0.00%> (?)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nextcloud#carryforward-flags-in-the-pull-request-comment) to find out more.

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[st3iny]

Acceptance test failure is unrelated (incompatible with Nextcloud 27?!).