"failed to retrieve some files" and I don't know what's the effect

Nobody has claimed this yet.

recently I found I can't receive AUR updates. And manually run pamac shows this

```
$ pamac update
Preparing...
==== AUTHENTICATING FOR org.manjaro.pamac.commit ====
Authentication is required to install, update, or remove packages
Authenticating as: lance6716 (lance)
Password:
==== AUTHENTICATION COMPLETE ====
Synchronizing package databases...
failed to retrieve some files
Nothing to do.
Transaction successfully finished.
```

```
$ pamac --version
pamac-cli 11.7.3 - libpamac 11.7.3
Copyright © 2019-2024 Guillaume Benoit
This program is free software, you can redistribute it under the terms of the GNU GPL.

$ cat /etc/*-release
Manjaro Linux
DISTRIB_ID="ManjaroLinux"
DISTRIB_RELEASE="25.0.6"
DISTRIB_CODENAME="Zetar"
DISTRIB_DESCRIPTION="Manjaro Linux"
Manjaro Linux
NAME="Manjaro Linux"
PRETTY_NAME="Manjaro Linux"
ID=manjaro
ID_LIKE=arch
BUILD_ID=rolling
ANSI_COLOR="32;1;24;144;200"
HOME_URL="https://manjaro.org/"
DOCUMENTATION_URL="https://wiki.manjaro.org/"
SUPPORT_URL="https://forum.manjaro.org/"
BUG_REPORT_URL="https://manjaro.org/help/"
PRIVACY_POLICY_URL="https://manjaro.org/privacy-policy/"
LOGO=manjarolinux
```

The report provides no source file, test, or entry point. Start by reproducing `pamac update` on the listed Manjaro release and inspect the package-database synchronization path and its retrieval errors; done means identifying why files fail to retrieve and documenting or testing the resulting fix.

Written by the indexing model from the issue text.