Updated the GitHub workflows and/or the README file to the latest ver… #153

Job	Run time
Set-Matrix-Private	1s
Set-Matrix-Private	1s
windows-latest (r release, flags binaries)	2m 53s
windows-latest (r release, flags binaries)	2m 53s
macOS-latest (r release, flags binaries, ubsan)	1m 21s
macOS-latest (r release, flags binaries, ubsan)	1m 21s
ubuntu-latest (r release, flags full, ubsan, debug)	1m 55s
ubuntu-latest (r release, flags full, ubsan, debug)	1m 55s
ubuntu-latest (r devel, flags vignettes, remote)	5m 55s
ubuntu-latest (r devel, flags vignettes, remote)	5m 55s
ubuntu-latest (r release, flags full, covr)	1m 41s
ubuntu-latest (r release, flags full, covr)	1m 47s
	27m 38s

Provide feedback