[New quic-go version] v0.43.0

## *quic-go.net*: Launching a new Documentation Site

With this release, we're launching a new documentation site for the quic-go projects (quic-go itself, HTTP/3, webtransport-go, and soon, masque-go): [quic-go.net](https://quic-go.net).

The documentation site aims to explain QUIC concepts and how they are made accessible using quic-go's API. This site replaces the wiki, and the ever-growing README files.

A lot of work has gone into the documentation already, but we're by no means done yet. The entire source is public in [https://github.com/quic-go/docs/](https://github.com/quic-go/docs/), and we're happy about community contributions.

## HTTP Datagrams (RFC 9297)

This release adds support for HTTP Datagrams ([RFC 9297](https://datatracker.ietf.org/doc/html/rfc9297)), both on the client and on the server side ([#4452](https://github.com/quic-go/quic-go/pull/4452)). HTTP Datagrams are used in WebTransport in CONNECT-UDP ([RFC 9298](https://datatracker.ietf.org/doc/html/rfc9298)), a…

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## Would you like to know more?
Read the full article on the following website:

https://github.com/quic-go/quic-go/releases/tag/v0.43.0

This issue is a release announcement and does not name a file, test, entry point, or requested change. Read the linked quic-go documentation repository and the v0.43.0 release article first; the scope and definition of done would need to be clarified before work can begin.

Written by the indexing model from the issue text.