Update minimum Tekton LTS to v0.56 #3603

Job	Run time
e2e (v1.28.13, v0.56.8)	34m 28s
e2e (v1.28.13, v0.56.8)	34m 28s
test-docker-build (base)	40s
test-docker-build (base)	40s
e2e (v1.28.13, v0.65.0)	36m 33s
e2e (v1.28.13, v0.65.0)	36m 33s
integration (v1.28.13, v0.56.8)	29m 2s
integration (v1.28.13, v0.56.8)	29m 2s
test-docker-build (git)	1m 4s
test-docker-build (git)	1m 4s
e2e (v1.31.0, v0.56.8)	21m 56s
e2e (v1.31.0, v0.56.8)	35m 50s
integration (v1.28.13, v0.65.0)	28m 41s
integration (v1.28.13, v0.65.0)	28m 41s
integration (v1.31.0, v0.56.8)	28m 19s
integration (v1.31.0, v0.56.8)	28m 19s
test-docker-build (image-processing)	53s
test-docker-build (image-processing)	53s
unit	3m 28s
unit	3m 28s
e2e (v1.31.0, v0.65.0)	34m 55s
e2e (v1.31.0, v0.65.0)	35m 52s
integration (v1.31.0, v0.65.0)	28m 38s
integration (v1.31.0, v0.65.0)	28m 38s
test-docker-build (waiter)	36s
test-docker-build (waiter)	36s
	8h 33m 17s

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