chore(deps): update traefik docker tag to v2.8.8

This MR contains the following updates:

Package	Update	Change
traefik	patch	v2.8.7 -> v2.8.8

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Release Notes

containous/traefik

v2.8.8

Compare Source

Bug fixes:

• [server] Update golang.org/x/net to latest version (#​9398 by tspearconquest)

Documentation:

• [docker] Fix watch option description for Docker provider (#​9391 by bhuisgen)
• [ecs] Fix autoDiscoverClusters option documentation for ECS provider (#​9392 by johnpekcan)
• [k8s] Improve documentation for publishedService and IP options (#​9380 by samip5)

v2.8.8

Compare Source

Bug fixes:

• [server] Update golang.org/x/net to latest version (#​9398 by tspearconquest)

Documentation:

• [docker] Fix watch option description for Docker provider (#​9391 by bhuisgen)
• [ecs] Fix autoDiscoverClusters option documentation for ECS provider (#​9392 by johnpekcan)
• [k8s] Improve documentation for publishedService and IP options (#​9380 by samip5)

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