chore(deps): update traefik docker tag to v3.1.6 #670

Job	Run time
Build Sablier docker image once and share it to E2E jobs	1m 29s
Build ProxyWasm Plugin once and share it to ProxyWasm E2E jobs	43s
Build Caddy docker image once and share it to Caddy E2E jobs	1m 31s
Build Caddy Sablier Plugin	9s
Build Traefik Sablier Plugin	6s
Run Sablier E2E tests for Proxywasm middleware on Envoy (docker)	1m 19s
Run Sablier E2E tests for Nginx NJS module with Sablier (docker)	1m 27s
Run Sablier E2E tests for Proxywasm middleware on Apache APISIX (docker)	1m 23s
Run Sablier E2E tests for Nginx NJS module with Sablier (docker_swarm)	2m 31s
Run Sablier E2E tests for Proxywasm middleware on Nginx (docker)	1m 35s
Run Sablier E2E tests for Traefik middleware (docker)	1m 9s
Run Sablier E2E tests for Traefik middleware (docker_swarm)	2m 23s
Run Sablier E2E tests for Traefik middleware (kubernetes)	1m 52s
Run Sablier E2E tests for Caddy middleware (docker)	1m 18s
Run Sablier E2E tests for Caddy middleware (docker_swarm)	2m 57s
	21m 52s

Provide feedback