Update x-checker-data url templates

[wjt]

• libXmu has changed its archive format.
• polkit now just has GitLab releases
• the kernel.org mirror of pciutils is documented to lag behind the canonical host

[flathubbot]

Started test build 8242

[flathubbot]

Started test build 8246

[wjt]

Sadly the 6.2.1 update that FEDC proposes still doesn't work. But we can at least update these dependencies.

[flathubbot]

Build 8242 successful To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/120694/com.anydesk.Anydesk.flatpakref

[flathubbot]

Build 8246 successful To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/120698/com.anydesk.Anydesk.flatpakref