chore(deps): update traefik docker tag to v3.1.2 #596

Job	Run time
Build Caddy docker image once and share it to Caddy E2E jobs	1m 9s
Build Sablier docker image once and share it to E2E jobs	1m 27s
Build Caddy Sablier Plugin	16s
Build Traefik Sablier Plugin	8s
Build ProxyWasm Plugin once and share it to ProxyWasm E2E jobs	37s
Run Sablier E2E tests for Caddy middleware (docker)	1m 35s
Run Sablier E2E tests for Traefik middleware (docker)	1m 21s
Run Sablier E2E tests for Caddy middleware (docker_swarm)	3m 27s
Run Sablier E2E tests for Traefik middleware (docker_swarm)	2m 43s
Run Sablier E2E tests for Proxywasm middleware on Apache APISIX (docker)	1m 34s
Run Sablier E2E tests for Nginx NJS module with Sablier (docker)	1m 35s
Run Sablier E2E tests for Traefik middleware (kubernetes)	1m 53s
Run Sablier E2E tests for Nginx NJS module with Sablier (docker_swarm)	3m 0s
Run Sablier E2E tests for Proxywasm middleware on Nginx (docker)	1m 47s
Run Sablier E2E tests for Proxywasm middleware on Envoy (docker)	1m 31s
	24m 3s

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