Update traefik Docker tag to v2.4.8

This MR contains the following updates:

Package	Update	Change
traefik	patch	2.4.6 -> v2.4.8

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Release Notes

containous/traefik

v2.4.8

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Bug fixes:

• [acme] Update go-acme/lego to v4.3.1 (#​7980 by ldez)
• [acme] Update go-acme/lego to v4.3.0 (#​7975 by ldez)
• [k8s,k8s/gatewayapi] Update to gateway-api v0.2.0 (#​7943 by jbdoumenjou)
• [pilot,webui] Adding an option to (de)activate Pilot integration into the Traefik dashboard (#​7994 by tomMoulard)
• [rules] Raise errors for non-ASCII domain names in a router&#​39;s rules (#​7986 by rtribotte)
• [server] Update pires/go-proxyproto to v0.5.0 (#​7948 by mschneider82)

Documentation:

• [middleware] Improve basic auth middleware httpasswd example (#​7992 by d3473r)
• [middleware] Add missing traefik. prefix across sample config (#​7990 by deepyaman)
• [middleware] Remove a no longer needed note (#​7979 by cmcga1125)

v2.4.8

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Bug fixes:

• [acme] Update go-acme/lego to v4.3.1 (#​7980 by ldez)
• [acme] Update go-acme/lego to v4.3.0 (#​7975 by ldez)
• [k8s,k8s/gatewayapi] Update to gateway-api v0.2.0 (#​7943 by jbdoumenjou)
• [pilot,webui] Adding an option to (de)activate Pilot integration into the Traefik dashboard (#​7994 by tomMoulard)
• [rules] Raise errors for non-ASCII domain names in a router&#​39;s rules (#​7986 by rtribotte)
• [server] Update pires/go-proxyproto to v0.5.0 (#​7948 by mschneider82)

Documentation:

• [middleware] Improve basic auth middleware httpasswd example (#​7992 by d3473r)
• [middleware] Add missing traefik. prefix across sample config (#​7990 by deepyaman)
• [middleware] Remove a no longer needed note (#​7979 by cmcga1125)

v2.4.7

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All Commits

Bug fixes:

• [acme] Fix: double close chan on TLS challenge (#​7956 by ldez)
• [provider] Bump paerser to v0.1.2 (#​7945 by jbdoumenjou)
• [server] Feature: tune transport buffer size to increase performance (#​7957 by mvertes)

Documentation:

• [service] Fix ServersTransport documentation (#​7942 by rtribotte)

v2.4.7

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All Commits

Bug fixes:

• [acme] Fix: double close chan on TLS challenge (#​7956 by ldez)
• [provider] Bump paerser to v0.1.2 (#​7945 by jbdoumenjou)
• [server] Feature: tune transport buffer size to increase performance (#​7957 by mvertes)

Documentation:

• [service] Fix ServersTransport documentation (#​7942 by rtribotte)

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