v2.5.2

This patch release fixes bugs, adds some new features, and makes worthwhile enhancements. We recommend everyone test and upgrade!

Many improvements have been made to the `reverse_proxy` module.

Highlights:

- **New [`/adapt` admin endpoint](https://caddyserver.com/docs/api#post-adapt):** Use your installed config adapters via API in addition to the existing `caddy adapt` CLI command.
- **New `Etag`/`If-Match` support for config API:** Safely update your config concurrently and avoid collisions by using [our unique Etag implementation](https://caddyserver.com/docs/api#concurrent-config-changes).
- **Rename copied headers from reverse_proxy:** If you're using `handle_response`, you can more easily map headers to a different name for clients.
- **Many HTTP matchers have been added to CEL:** You can now use the logic of our HTTP request matchers in CEL expressions.
- **Notable bug fixes:** EAB reuse, various QUIC & HTTP/3 fixes, more specific HTTP status codes, various reverse proxy fixes.


## Changelog
* 660c59b6 admin: Implement /adapt endpoint (close #4465) (#4846)
* ad3a83fb admin: expect quoted ETags (#4879)
* f259ed52 admin: support ETag on config endpoints (#4579)
* 1498132e caddyhttp: Log error from CEL evaluation (fix #4832)
* 0a14f97e caddytls: Make peer certificate verification pluggable (#4389)
* 412dcc07 caddytls: Reuse issuer between PreCheck and Issue (#4866)
* 499ad6d1 core: Micro-optim in run() (#4810)
* c0f76e9e fileserver: Use safe redirects in file browser
* 58e05cab forwardauth: Fix case when `copy_headers` is omitted (#4856)
* 0b6f7643 forwardauth: Support renaming copied headers, block support (#4783)
* 8bac134f go.mod: Bump up quic-go to v0.28.0, fixes for BC breaks (#4867)
* 3d18bc56 go.mod: Update go-yaml to v3
* 56013934 go.mod: Update some dependencies
* 8e6bc360 go.mod: Upgrade some dependencies
* 53c4d788 headers: Only replace known placeholders (#4880)
* 0bcd02d5 headers: Support wildcards for delete ops (close #4830) (#4831)
* 58970cae httpcaddyfile: Add `{err.*}` placeholder shortcut (#4798)
* b687d7b9 httpcaddyfile: Support multiple values for `default_bind` (#4774)
* a9267791 reverseproxy: Add --internal-certs CLI flag #3589 (#4817)
* aaf6794b reverseproxy: Add renegotiation param in TLS client (#4784)
* 54d1923c reverseproxy: Adjust new TLS Caddyfile directive names (#4872)
* 7f9b1f43 reverseproxy: Correct the `tls_server_name` docs (#4827)
* c82fe911 reverseproxy: Dynamic ServerName for TLS upstreams (#4836)
* d6bc9e0b reverseproxy: Err 503 if all upstreams unavailable
* 98468af8 reverseproxy: Fix double headers in response handlers (#4847)
* 25f10511 reverseproxy: Fix panic when TLS is not configured (#4848)
* 5e729c1e reverseproxy: HTTP 504 for upstream timeouts (#4824)
* f9b42c37 reverseproxy: Make TLS renegotiation optional
* b6e96fa3 reverseproxy: Skip TLS for certain configured ports (#4843)
* 57d27c1b reverseproxy: Support http1.1>h2c (close #4777) (#4778)
* 9864b138 reverseproxy: api: Remove misleading 'healthy' value
* 693e9b52 rewrite: Handle fragment before query (fix #4775)
* 6891f7f4 templates: Add `humanize` function (#4767)
* 9e760e2e templates: Documentation consistency (#4796)

## New Contributors
* @nekohasekai made their first contribution in https://github.com/caddyserver/caddy/pull/4782
* @davidbgk made their first contribution in https://github.com/caddyserver/caddy/pull/4796
* @git001 made their first contribution in https://github.com/caddyserver/caddy/pull/4767
* @varianone made their first contribution in https://github.com/caddyserver/caddy/pull/4817
* @Gr33nbl00d made their first contribution in https://github.com/caddyserver/caddy/pull/4389
* @yaslama made their first contribution in https://github.com/caddyserver/caddy/pull/4784
* @kresike made their first contribution in https://github.com/caddyserver/caddy/pull/4836
* @TristonianJones made their first contribution in https://github.com/caddyserver/caddy/pull/4715
* @jhwz made their first contribution in https://github.com/caddyserver/caddy/pull/4579

**Full Changelog**: https://github.com/caddyserver/caddy/compare/v2.5.1...v2.5.2