Update dependency traefik/traefik to v2.8.7

This MR contains the following updates:

Package	Type	Update	Change
traefik/traefik	ironbank-github	patch	v2.8.5 -> v2.8.7
traefik/traefik		patch	v2.8.5 -> v2.8.7

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Release Notes

traefik/traefik

v2.8.7

Compare Source

Bug fixes:

• [consulcatalog] Fix UDP loadbalancer tags not being used with Consul Catalog (#​9357 by t3hchipmunk)
• [docker,rancher,ecs,provider] Simplify AddServer algorithm (#​9358 by ldez)
• [plugins] Allow empty plugin configuration (#​9338 by ldez)
• [rules] Fix query parameter matching with equal (#​9369 by ldez)
• [server] Optimize websocket headers handling (#​9360 by juliens)

Documentation:

• [ecs] Add documentation for ECS constraints option (#​9354 by rtribotte)
• [k8s/gatewayapi] Fix link to RouteNamespaces (#​9349 by ldez)
• Add documentation for json schema usage to validate config in the FAQ (#​9340 by rtribotte)
• Add a note on case insensitive regex matching (#​9322 by NEwa-05)

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