[Release 1.35] Bump Traefik image and chart

[manuelbuil]

Backport fix for Bump Traefik v3.7.4

• Bump Traefik v3.7.4 #10498

[aganesh-suse]

Release Branch: release-1.35
Verified with commit: cde6a5f

$ rke2 -v
rke2 version v1.35.5+dev.cde6a5f5 (cde6a5f574c56c9c17d2e3de8f1b621033e1612e)
go version go1.25.9 X:boringcrypto

$ /var/lib/rancher/rke2/bin/kubectl --kubeconfig /etc/rancher/rke2/rke2.yaml get node -o yaml | grep 'traefik' -A1
      - docker.io/rancher/hardened-traefik@sha256:<redacted>
      - docker.io/rancher/hardened-traefik:v3.7.4-build20260608
      sizeBytes: 49992620

$ sudo cat /var/lib/rancher/rke2/data/*/charts/* | grep 'traefik'
  name: "rke2-traefik-crd"
    helm.cattle.io/chart-url: "https://rke2-charts.rancher.io/assets/rke2-traefik/rke2-traefik-crd-40.1.003.tgz"
  name: "rke2-traefik"
    helm.cattle.io/chart-url: "https://rke2-charts.rancher.io/assets/rke2-traefik/rke2-traefik-40.1.003.tgz"