Bump python from `7476637` to `f78ea8a` #2752

Job	Run time
k8s-tests	1m 25s
calico-tests-orig-vs-opt-comparison	47s
calico-tests	1m 57s
k8s-tests-orig-vs-opt-comparison	2m 7s
lint	15s
test-docker	26s
test-docker-ubi	35s
unit-tests	11s
build_package	28s
fw-rules-assertion-tests	42s
istio-tests	1m 8s
istio-tests-orig-vs-opt-comparison	1m 16s
test_package	18s
	11m 35s

Provide feedback