chore: repoint URLs at git.swaits.com and bump for release

Rewrites remaining github.com / git.sr.ht references to git.swaits.com,
translating GitHub URL shapes to Gitea's (/blob/<ref>/ -> /src/branch/<ref>/,
/tree/<tag> -> /src/tag/<tag>, /actions/workflows/X -> /actions?workflow=X,
/edit/ -> /_edit/).

Left pointing at GitHub on purpose: pull-request links (PRs were not migrated)
and GitHub-only surfaces Gitea lacks (security advisories, discussions).

README.md

@@ -2,7 +2,7 @@
 
 [![crates.io](https://img.shields.io/crates/v/iroh-gossip-rendezvous.svg)](https://crates.io/crates/iroh-gossip-rendezvous)
 [![docs.rs](https://img.shields.io/docsrs/iroh-gossip-rendezvous)](https://docs.rs/iroh-gossip-rendezvous)
-[![CI](https://github.com/swaits/iroh-gossip-rendezvous/workflows/CI/badge.svg)](https://github.com/swaits/iroh-gossip-rendezvous/actions)
+[![CI](https://git.swaits.com/swaits/iroh-gossip-rendezvous/actions/workflows/ci.yml/badge.svg)](https://git.swaits.com/swaits/iroh-gossip-rendezvous/actions)
 [![MSRV](https://img.shields.io/badge/MSRV-1.93.0-blue)](#msrv)
 [![License: MIT](https://img.shields.io/badge/license-MIT-green.svg)](LICENSE)