Bump node version from 12 to 18 and bump 'actions/setup-node' GHA fro… #14

Job	Run time
if_key_exists=fail / key doesn't exist (ubuntu-18.04, centos:7)	1s
if_key_exists=ignore / key doesn't exist (ubuntu-18.04, centos:7)	1s
if_key_exists=fail / key doesn't exist (ubuntu-20.04, centos:7)	26s
if_key_exists=ignore / key exists (ubuntu-18.04, centos:7)	1s
if_key_exists=ignore / key doesn't exist (ubuntu-20.04, centos:7)	36s
if_key_exists=ignore / key exists (ubuntu-20.04, centos:7)	33s
if_key_exists=fail / key exists (ubuntu-18.04, centos:7)	1s
if_key_exists=fail / key exists (ubuntu-20.04, centos:7)	35s
if_key_exists=replace / key doesn't exist (ubuntu-18.04, centos:7)	1s
if_key_exists=replace / key exists (ubuntu-18.04, centos:7)	1s
if_key_exists=replace / key doesn't exist (ubuntu-20.04, centos:7)	26s
if_key_exists=replace / key exists (ubuntu-20.04, centos:7)	24s
Connect to github.com (PEM format) (ubuntu-18.04, centos:7)	1s
without known_hosts file (ubuntu-18.04, centos:7)	1s
Connect to github.com (PEM format) (ubuntu-20.04, centos:7)	29s
Connect to github.com (PKCS8 format) (ubuntu-18.04, centos:7)	1s
without known_hosts file (ubuntu-20.04, centos:7)	25s
Connect to github.com (PKCS8 format) (ubuntu-20.04, centos:7)	24s
Connect to github.com (RFC4716 format) (ubuntu-18.04, centos:7)	1s
Connect to github.com (RFC4716 format) (ubuntu-20.04, centos:7)	29s
	4m 57s

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