Update systemd, libde265, libavif and libheif modules

[flathubbot]

systemd: Update systemd-260.1.tar.gz to 260.2
libde265: Update libde265-1.0.19.tar.gz to 1.1.1
libavif: Update libavif-1.4.1.tar.gz to 1.4.2
libheif: Update libheif-1.22.2.tar.gz to 1.23.0

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[ilya-fedin]

bot, build

[flathubbot]

🚧 Test build enqueued.

[flathubbot]

🚧 Started test build.

[flathubbot]

✅ Test build succeeded. To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/293127/io.github.kotatogram.flatpakref

Built for aarch64 and x86_64 architectures.

⚠️ Linter warnings:

Warnings can be promoted to errors in the future. Please try to resolve them.

• 'runtime-update-available-to-org.freedesktop.Platform-25.08' warning found in linter manifest check. Details: Please consider updating to the latest runtime version
• 'runtime-is-eol-org.freedesktop.Platform-23.08' warning found in linter manifest check. Details: Please consider updating to a supported runtime version. This will be promoted to an error if it falls behind by 3 consecutive runtime versions.

[flathubbot]

🤖 This PR passed CI, and automerge-flathubbot-prs is true in flathub.json, so I'm merging it automatically. 🤖