Traefik - v2.6.0

Enhancements:
- [acme] Allow configuration of ACME certificates duration (#8046 by pmontepagano)
- [consul,consulcatalog] Support consul enterprise namespaces in consul catalog provider (#8592 by kevinpollet)
- [k8s,k8s/gatewayapi] Update gateway api provider to v1alpha2 (#8535 by kevinpollet)
- [k8s,k8s/gatewayapi] Support gateway api RouteNamespaces (#8299 by tomMoulard)
- [k8s/crd] Support Kubernetes basic-auth secrets (#8189 by dtomcej)
- [metrics] Add configurable tags to influxdb metrics (#8308 by Tetha)
- [metrics] Add prefix to datadog metrics (#8234 by fredwangwang)
- [middleware,tcp] Add in flight connection middleware (#8429 by tomMoulard)
- [middleware] Add Organizational Unit to passtlscert middleware (#7958 by FernFerret)
- [middleware] Allow configuration of minimum body size for compress middleware (#8239 by lus)
- [middleware] Ceil Retry-After value in the rate-limit middleware (#8581 by pyaillet)
- [middleware] Refactor Exponential Backoff (#7519 by danieladams456)
- [server,k8s/crd,k8s] Allow configuration of HTTP/2 readIdleTimeout and pingTimeout (#8539 by tomMoulard)
- [server] Allow configuration of advertised port for HTTP/3 (#8131 by valerauko)
- [tracing] Upgrade Instana tracer and make process profiling configurable (#8334 by andriikushch)

Bug fixes:
- [consul,kv] Support Consul KV Enterprise namespaces (#8692 by kevinpollet)
- [consul] Support token authentication for Consul KV (#8712 by kevinpollet)
- [consulcatalog] Configure Consul Catalog namespace at client level (#8725 by kevinpollet)
- [tracing] Upgrade Instana tracer dependency (#8687 by andriikushch)
- [logs] Redact credentials before logging (#8699 by ibrahimalihc)

Misc:
- Merge current v2.5 into v2.6 (#8720 by tomMoulard)
- Merge current v2.5 into v2.6 (#8717 by tomMoulard)
- Merge current v2.5 into v2.6 (#8714 by rtribotte)
- Merge current v2.5 into v2.6 (#8688 by tomMoulard)
- Merge current v2.5 into v2.6 (#8664 by tomMoulard)
- Merge current v2.5 into v2.6 (#8651 by tomMoulard)
- Merge current v2.5 into master (#8645 by tomMoulard)
- Merge current v2.5 into master (#8609 by tomMoulard)
- Merge current v2.5 into master (#8563 by kevinpollet)
- Merge current v2.5 into master (#8498 by kevinpollet)
- Merge current v2.5 into master (#8461 by tomMoulard)
- Merge current v2.5 into master (#8435 by jbdoumenjou)
- Merge current v2.5 into master (#8419 by rtribotte)
- Merge current v2.5 into master (#8411 by rtribotte)
- Merge current v2.5 into master (#8316 by rtribotte)
- Merge current v2.5 into master (#8298 by tomMoulard)
- Merge current v2.5 into master (#8289 by rtribotte)
- Merge current v2.5 into master (#8241 by rtribotte)