chore(deps)!: update tls deps, remove built-in tls server support (#3091)

Update reqwest from 0.12 to 0.13 and remove the built-in TLS termination
from atuin-server. Users should use a reverse proxy (nginx, caddy,
traefik) for TLS/HTTPS support instead.

This removes:
- axum-server and rustls dependencies
- The [tls] configuration section
- The launch_with_tls function

Also updates metrics-exporter-prometheus from 0.17 to 0.18.

The reverse proxy approach is standard and provides better flexibility
for certificate management. I'd rather keep our server stack as minimal
as possible.

<!-- Thank you for making a PR! Bug fixes are always welcome, but if
you're adding a new feature or changing an existing one, we'd really
appreciate if you open an issue, post on the forum, or drop in on
Discord -->

## Checks
- [ ] I am happy for maintainers to push small adjustments to this PR,
to speed up the review cycle
- [ ] I have checked that there are no existing pull requests for the
same thing

0 files changed, 0 insertions, 0 deletions