Error updating from 26.1.2_5 to 26.1.3

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Hello,

we're trying to upgrade OPNsense 26.1.2_5 to 26.1.3, but we're getting the following error, as per the attachment: "Could not find the repository on the selected mirror." This is most likely caused by the SunnyValley repositories.

How can I fix this?

Thank you very much.