build(deps): bump caddy from 2.9.1 to 2.10.0 in /documentation (#593)

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Bumps caddy from 2.9.1 to 2.10.0.


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documentation/Dockerfile

@@ -1,4 +1,4 @@
-FROM caddy:2.9.1
+FROM caddy:2.10.0
 
 COPY Caddyfile /etc/caddy/Caddyfile
 COPY site /srv