chore(deps): update traefik docker tag to v2.5.6

This MR contains the following updates:

Package	Type	Update	Change
traefik	Kustomization	patch	v2.5.5 -> v2.5.6

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Release Notes

containous/traefik

v2.5.6

Compare Source

Bug fixes:

• [middleware] Process all X-Forwarded-For headers in the request (#​8596 by kevinpollet)
• [plugins] Update Yaegi to v0.11.2 (#​8650 by ldez)
• [server] Update golang.org/x/net dependency version (#​8635 by kevinpollet)

Documentation:

• [api] Add missing API endpoints documentation (#​8649 by ichxxx)
• [middleware] Fix passTLSClientCert CRD example name (#​8637 by ddtmachado)
• [middleware] Correct documentation in middleware overview (#​8636 by Alestrix)

v2.5.6

Compare Source

Bug fixes:

• [middleware] Process all X-Forwarded-For headers in the request (#​8596 by kevinpollet)
• [plugins] Update Yaegi to v0.11.2 (#​8650 by ldez)
• [server] Update golang.org/x/net dependency version (#​8635 by kevinpollet)

Documentation:

• [api] Add missing API endpoints documentation (#​8649 by ichxxx)
• [middleware] Fix passTLSClientCert CRD example name (#​8637 by ddtmachado)
• [middleware] Correct documentation in middleware overview (#​8636 by Alestrix)

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