deps: update actions/checkout action to v3.6.0 #15296

Job	Run time
Prepare CI Run	4s
Store tag of the built images	2s
Unit Tests (lifecycle-operator, lifecycle-operator/)	1m 5s
Build Docker Image (lifecycle-operator, lifecycle-operator/)	2m 14s
Unit Tests (metrics-operator, metrics-operator/)	57s
Build Docker Image (metrics-operator, metrics-operator/)	3m 17s
Unit Tests (scheduler, scheduler/)	37s
Build Docker Image (scheduler, scheduler/)	2m 57s
Unit Tests (certificate-operator, keptn-cert-manager/)	32s
Build Docker Image (deno-runtime, runtimes/deno-runtime/)	18s
Build Docker Image (python-runtime, runtimes/python-runtime/)	1m 21s
Build Docker Image (certificate-operator, keptn-cert-manager/)	2m 11s
Component Tests / Component Tests	2m 38s
Publish helm chart changes to charts repo	0s
Load Tests / Run load Tests	6m 16s
End to End Tests / Run E2E Tests (lifecycle-operator, lifecycle-operator/)	2m 52s
Integration Tests (gates_off, allowed_ns_off) / Run Chainsaw Tests	18m 40s
End to End Tests / Run E2E Tests (scheduler, scheduler/)	3m 14s
Integration Tests (gates_off, allowed_ns_on) / Run Chainsaw Tests	2m 50s
Integration Tests (gates_on, allowed_ns_off) / Run Chainsaw Tests	18m 44s
Integration Tests (gates_on, allowed_ns_on) / Run Chainsaw Tests	3m 2s
	1h 13m 51s

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