fix: Restrict allowed JSON response HTTP codes

[ChristophWurst]

This fixes red Psalm CI after nextcloud/server#49882.

[ChristophWurst]

/backport to stable4.2

[ChristophWurst]

/backport to stable3.7

[backportbot]

The backport to stable4.2 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable4.2
git pull origin stable4.2

# Create the new backport branch
git checkout -b backport/10550/stable4.2

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 56207107

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/10550/stable4.2

Error: Failed to clone repository: Failed to checkout branches: fatal: ambiguous argument 'origin/stable4.2': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git [...] -- [...]'

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Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[ChristophWurst]

/backport to stable4.1