Rebase and bump to Flatpak 1.18.x

[bbhtt]

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🚧 Started test build.

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🚧 Started test build.

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

flatpak install --user https://dl.flathub.org/build-repo/292738/org.flatpak.Builder.flatpakref

Built for aarch64 and x86_64 architectures.

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🚧 Test build enqueued.

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🚧 Started test build.

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

flatpak install --user https://dl.flathub.org/build-repo/292822/org.flatpak.Builder.flatpakref

Built for aarch64 and x86_64 architectures.

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🚧 Test build enqueued.

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🚧 Started test build.

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

flatpak install --user https://dl.flathub.org/build-repo/293237/org.flatpak.Builder.flatpakref

Built for aarch64 and x86_64 architectures.

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🚧 Test build enqueued.

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🚧 Started test build.

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

flatpak install --user https://dl.flathub.org/build-repo/293438/org.flatpak.Builder.flatpakref

Built for aarch64 and x86_64 architectures.