Update library/traefik version from v3.1.6 to v3.2.0 #2648

Job	Run time
lint_shell_scripts	41s
lint_and_validate_templates_with_schema	15s
lint_and_validate_rendered_templates	10s
lint_and_validate_templates_with_schema (v3.5.0)	15s
test (latest, install)	1m 56s
test (stable, install, --set hub.image.name=quay.io/jupyterhub/k8s-hub-slim --set prePuller.hook....	2m 6s
test (v1.31, install, --set hub.existingSecret=test-hub-existing-secret --set proxy.secretToken=a...	1m 51s
test (v1.30, upgrade, stable, --set proxy.secretToken=aaaa1111 --set hub.cookieSecret=bbbb2222 --...	3m 1s
test (v1.29, upgrade, dev, --set proxy.secretToken=aaaa1111 --set hub.db.type=sqlite-pvc --set si...	2m 33s
test (v1.28, upgrade, 2.0.0, --set proxy.secretToken=aaaa1111 --set hub.cookieSecret=bbbb2222 --s...	3m 15s
	16m 3s

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