flatpak-vpn-crates.json is out of date - Perhaps a lint is needed?

[aaronschif]

Describe the bug

flatpak-vpn-crates.json is out of date. A simple ./flatpak-update-crates.sh seems to fix it. Creating an issue because this seems like it should be some sort of lint. A lint might run to check that Cargo.lock and flatpak-vpn-crates.json are consistent and prevent a merge otherwise.

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