Update checkout and codecov actions to v4 #322

Job	Run time
Pharo64-10 + app-config	32s
Pharo64-10 + app-control	37s
Pharo64-10 + app-info	29s
Pharo64-10 + core	29s
Pharo64-10 + dependent-sunit-extensions	34s
Pharo64-10 + deployment	39s
Pharo64-10 + development	56s
Pharo64-10 + examples	46s
Pharo64-10 + healthcheck	43s
Pharo64-10 + json-rpc	41s
Pharo64-10 + loggers	43s
Pharo64-10 + metrics	30s
Pharo64-10 + metrics-http	41s
Pharo64-10 + tests	44s
Pharo64-10 + tools	33s
Pharo64-11 + app-config	49s
Pharo64-11 + app-control	29s
Pharo64-11 + app-info	28s
Pharo64-11 + core	42s
Pharo64-11 + dependent-sunit-extensions	29s
Pharo64-11 + deployment	43s
Pharo64-11 + development	56s
Pharo64-11 + examples	50s
Pharo64-11 + healthcheck	30s
Pharo64-11 + json-rpc	34s
Pharo64-11 + loggers	51s
Pharo64-11 + metrics	30s
Pharo64-11 + metrics-http	33s
Pharo64-11 + tests	49s
Pharo64-11 + tools	17s
	19m 7s

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