caddy: 0.10.7 -> 0.10.9

[adisbladis]

Motivation for this change

Upstream version update.
Fixes some issues related to certificate renewal, adding support for quic backends.

There was a hugely controversial change in this release: a header advertising the sponsors of Caddy.
This change has since been reverted upstream but no new release was made because of the change.

I chose to apply this patch and added a comment to the next person who updates this package to remove it.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option build-use-sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • Linux
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.

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[Mic92]

Thanks!