Reduce the numbers of nodes for testing #23

Job	Run time
test-path-length	15s
build (ubuntu-20.04, 3.9.9, minimal)	46s
build (ubuntu-20.04, 3.9.9, maximal)	49s
build (ubuntu-20.04, 3.10.6, minimal)	56s
build (ubuntu-20.04, 3.10.6, maximal)	44s
test-python (ubuntu-20.04, 3.9.9, minimal)	13s
test-yaml (2, 0, minimal)	15s
test-python (ubuntu-20.04, 3.9.9, maximal)	21s
lint-files (maximal)	23s
test-yaml (2, 0, maximal)	16s
test-api (maximal)	20s
test-yaml (2, 1, minimal)	15s
test-python (ubuntu-20.04, 3.10.6, minimal)	22s
test-python (ubuntu-20.04, 3.10.6, maximal)	14s
test-yaml (2, 1, maximal)	14s
check-version-and-changelog	12s
check-for-functional-changes	0s
deploy	0s
	6m 35s

Provide feedback