doc/release-notes: move syncthing update to 25.11

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nixos
doc
manual
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nixos/doc/manual/release-notes/rl-2505.section.md
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inputs.nixpkgs.url = "https://channels.nixos.org/nixos-25.05/nixexprs.tar.xz";
```
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- Syncthing has been updated to version 2.0.0.
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<!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->
## New Modules {#sec-release-25.05-new-modules}
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nixos/doc/manual/release-notes/rl-2511.section.md
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- The Qt 5-based versions of KDE Gear, Plasma, Maui and Deepin have been removed. Users are advised to migrate to Plasma 6 and Gear 25.08, available under `kdePackages`.
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- Syncthing has been updated to version 2.0.0.
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## New Modules {#sec-release-25.11-new-modules}
<!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->