Update traefik Docker tag to v2.9.4

This MR contains the following updates:

Package	Type	Update	Change
traefik	Kustomization	patch	v2.9.1 -> v2.9.4

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Release Notes

containous/traefik

v2.9.4

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Bug fixes:

• [acme] Update go-acme/lego to v4.9.0 (#​9413 by tony-defa)
• [kv,redis] Fix Redis configuration type (#​9435 by ldez)
• [logs,middleware,metrics] Handle capture on redefined http.responseWriters (#​9440 by rtribotte)
• [middleware,k8s] Remove raw cert escape in PassTLSClientCert middleware (#​9412 by rtribotte)
• [plugins] Update Yaegi to v0.14.3 (#​9468 by ldez)
• Remove side effect on default transport tests (#​9460 by sdelicata)

Documentation:

• [k8s] Fix links to gateway API guides (#​9445 by kevinpollet)
• Simplify dashboard rule example (#​9454 by sosoba)
• Add v2.9 to release page (#​9438 by kevinpollet)

v2.9.4

Compare Source

All Commits

Bug fixes:

• [acme] Update go-acme/lego to v4.9.0 (#​9413 by tony-defa)
• [kv,redis] Fix Redis configuration type (#​9435 by ldez)
• [logs,middleware,metrics] Handle capture on redefined http.responseWriters (#​9440 by rtribotte)
• [middleware,k8s] Remove raw cert escape in PassTLSClientCert middleware (#​9412 by rtribotte)
• [plugins] Update Yaegi to v0.14.3 (#​9468 by ldez)
• Remove side effect on default transport tests (#​9460 by sdelicata)

Documentation:

• [k8s] Fix links to gateway API guides (#​9445 by kevinpollet)
• Simplify dashboard rule example (#​9454 by sosoba)
• Add v2.9 to release page (#​9438 by kevinpollet)

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