build: bump github.com/traefik/traefik/v2 from 2.11.10 to 2.11.15 in /apptests #5176

Job	Run time
Generate upgrade versions	4s
Extract app names from local repo	0s
Extract app names from PR Labels	1s
trigger-tests-all-apps-install-ondemand	0s
trigger-tests-all-apps-install-push	0s
trigger-install-tests-pr (reloader) / run-test-scenario	4m 15s
trigger-tests-all-apps-upgrade	0s
trigger-upgrade-tests-pr (v2.7.1, reloader) / run-test-scenario	4m 19s
trigger-upgrade-tests-pr (v2.7.0, reloader) / run-test-scenario	4m 17s
trigger-upgrade-tests-pr (v2.7.2, reloader) / run-test-scenario	4m 16s
trigger-upgrade-tests-pr (v2.7.3, reloader) / run-test-scenario	4m 14s
trigger-upgrade-tests-pr (v2.7.4-dev, reloader) / run-test-scenario	4m 10s
trigger-upgrade-tests-pr (v2.8.0, reloader) / run-test-scenario	4m 29s
trigger-upgrade-tests-pr (v2.8.1, reloader) / run-test-scenario	4m 22s
trigger-upgrade-tests-pr (v2.8.2, reloader) / run-test-scenario	4m 18s
	38m 45s

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