fix(node16): Use action/checkout v4 as Node 16 is deprecated #188

Job	Run time
Add-on test (stable, ddev/ddev-redis-commander)	3m 22s
Add-on test (stable, ddev/ddev-mongo)	4m 29s
Add-on test (stable, ddev/ddev-adminer)	2m 56s
Add-on test (stable, ddev/ddev-redis)	4m 46s
Add-on test (stable, ddev/ddev-solr)	3m 36s
Add-on test (stable, ddev/ddev-sqlsrv)	4m 25s
Add-on test (stable, ddev/ddev-pdfreactor)	4m 2s
Add-on test (stable, ddev/ddev-memcached)	3m 9s
Add-on test (stable, ddev/ddev-cron)	7m 25s
Add-on test (stable, ddev/ddev-elasticsearch)	6m 52s
Add-on test (HEAD, ddev/ddev-redis-commander)	3m 54s
Add-on test (HEAD, ddev/ddev-mongo)	4m 57s
Add-on test (HEAD, ddev/ddev-adminer)	2m 53s
Add-on test (HEAD, ddev/ddev-redis)	5m 17s
Add-on test (HEAD, ddev/ddev-solr)	4m 28s
Add-on test (HEAD, ddev/ddev-sqlsrv)	4m 51s
Add-on test (HEAD, ddev/ddev-pdfreactor)	4m 52s
Add-on test (HEAD, ddev/ddev-memcached)	4m 5s
Add-on test (HEAD, ddev/ddev-cron)	7m 53s
Add-on test (HEAD, ddev/ddev-elasticsearch)	7m 1s
	1h 35m 13s

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