Switch version in main branch to 4.0.0.dev #12506

Job	Run time
Install Rubygems on Windows (3.3)	3m 27s
Install Rubygems on Windows (jruby)	4m 31s
Install Rubygems on Windows (3.2)	3m 56s
Handling issues with a shared gem home (dev)	19s
Install Rubygems on Windows (3.4)	4m 35s
Handling issues with a shared gem home (system)	17s
Handling gems shipped by default with RVM (3.3, 3.3.9)	9s
Install Rubygems on Ubuntu (3.2, no-openssl)	1m 48s
Install Rubygems on Ubuntu (3.2, openssl)	2m 8s
Install Rubygems on Ubuntu (3.3, openssl)	2m 14s
Install Rubygems on Ubuntu (3.4, openssl)	2m 1s
Install Rubygems on Ubuntu (3.3, no-openssl)	1m 48s
Install Rubygems on Ubuntu (jruby, openssl)	3m 40s
Handling gems shipped by default with RVM (3.4, 3.4.5)	10s
Install Rubygems on Ubuntu (truffleruby, no-openssl)	3m 8s
Install Rubygems on Ubuntu (truffleruby, openssl)	3m 42s
Install Rubygems on Ubuntu (3.4, no-openssl)	1m 51s
Handling gems shipped by default with RVM (3.2, 3.2.9)	10s
Install Rubygems on Ubuntu (jruby, no-openssl)	3m 18s
All install-rubygems jobs pass	4s
	43m 16s

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