build(deps): bump github.com/caddyserver/caddy/v2 from 2.8.4 to 2.9.0 in /plugins/caddy #771

Job	Run time
Build Sablier docker image once and share it to E2E jobs	1m 41s
Build Caddy docker image once and share it to Caddy E2E jobs	1m 26s
Build ProxyWasm Plugin once and share it to ProxyWasm E2E jobs	37s
Build Caddy Sablier Plugin	1m 22s
Build Traefik Sablier Plugin	9s
Run Sablier E2E tests for Nginx NJS module with Sablier (docker)	1m 8s
Run Sablier E2E tests for Nginx NJS module with Sablier (docker_swarm)	2m 17s
Run Sablier E2E tests for Caddy middleware (docker)	1m 14s
Run Sablier E2E tests for Traefik middleware (docker)	1m 19s
Run Sablier E2E tests for Caddy middleware (docker_swarm)	2m 23s
Run Sablier E2E tests for Traefik middleware (docker_swarm)	2m 59s
Run Sablier E2E tests for Proxywasm middleware on Apache APISIX (docker)	1m 39s
Run Sablier E2E tests for Proxywasm middleware on Envoy (docker)	1m 14s
Run Sablier E2E tests for Traefik middleware (kubernetes)	2m 33s
Run Sablier E2E tests for Proxywasm middleware on Nginx (docker)	1m 26s
	23m 27s

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