v2.7.4

Caddy 2.7.4 rounds out some bug fixes from the 2.7 release. For example, [Go made a last-minute breaking change to a new API](https://github.com/quic-go/quic-go/releases/tag/v0.37.4) that broke quic-go (HTTP/3) on Go 1.21 just before Go 1.21 was released; we resolved a few issues with on-demand TLS that are now much improved from the 2.6 tree; a couple race conditions were fixed in dynamic reverse proxy upstreams. We hope you will be pleased with this new version!

[Caddy is on feature freeze until after 2.8](https://github.com/caddyserver/caddy/issues/5704) so we can improve our testing situation. These patches have all been tried to ensure they work as intended, but if you notice any issues please report them!

We encourage all users to test this new version and then upgrade. Thanks to all who get involved!

## Changelog
* 080db938 caddytls: Update docs for on-demand config
* d8135505 cmd: Require config for caddy validate (fix #5612) (#5614)
* a8492c06 fileserver: Don't repeat error for invalid method inside error context (#5705)
* 2d7d806f fileserver: Slightly more fitting icons
* f11c3c9f go.mod: Upgrade CertMagic and quic-go
* 5b9c850a go.mod: Upgrade golang.org/x/net to 0.14.0 (#5718)
* 936ee918 reverseproxy: Always return new upstreams (fix #5736) (#5752)
* 431adc09 templates: Fix httpInclude (fix #5698)

## New Contributors
* @faddat made their first contribution in https://github.com/caddyserver/caddy/pull/5707
* @shyim made their first contribution in https://github.com/caddyserver/caddy/pull/5718
* @AaronDewes made their first contribution in https://github.com/caddyserver/caddy/pull/5720

**Full Changelog**: https://github.com/caddyserver/caddy/compare/v2.7.3...v2.7.4