Bump nats from 2.9.19-scratch to 2.9.20-scratch in /Containers/talk

Bumps nats from 2.9.19-scratch to 2.9.20-scratch.

---
updated-dependencies:
- dependency-name: nats
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Containers/talk/Dockerfile

@@ -1,4 +1,4 @@
-FROM nats:2.9.19-scratch as nats
+FROM nats:2.9.20-scratch as nats
 FROM strukturag/nextcloud-spreed-signaling:1.1.3 as signaling
 FROM alpine:3.18.2 as janus