security: Upgrade mastodon to 4.2.7

Commit f7d7964299 pushed by axeman#114

Workflow check.yml

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19m21s

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Set up job3s

Check out repository code2s

https://github.com/nixbuild/nix-quick-install-action@v265s

Calculate flake.lock hash0s

Restore and cache Nix store2m19s

Prepare cachix2s

Run flake checks8m34s

Complete job8m16s