Fix `@licenses` array unmarshalling #10996

Job	Run time
Install Rubygems on Ubuntu (3.1, openssl)	1m 18s
Install Rubygems on Windows (3.1)	3m 47s
Install Rubygems on Ubuntu (3.1, no-openssl)	1m 4s
Install Rubygems on Windows (3.2)	3m 37s
Install Rubygems on Ubuntu (3.2, openssl)	1m 14s
Install Rubygems on Windows (3.3)	4m 31s
Install Rubygems on Ubuntu (3.2, no-openssl)	1m 3s
Install Rubygems on Ubuntu (3.3, openssl)	1m 26s
Install Rubygems on Ubuntu (3.3, no-openssl)	1m 5s
Install Rubygems on Ubuntu (3.4, openssl)	1m 14s
Install Rubygems on Windows (3.4)	6m 23s
Install Rubygems on Ubuntu (3.4, no-openssl)	51s
Install Rubygems on Windows (jruby-9.4)	3m 43s
Install Rubygems on Ubuntu (jruby, openssl)	2m 38s
Install Rubygems on Ubuntu (jruby, no-openssl)	2m 16s
Handling issues with a shared gem home (dev)	14s
Install Rubygems on Ubuntu (truffleruby, openssl)	2m 54s
Handling issues with a shared gem home (system)	12s
Install Rubygems on Ubuntu (truffleruby, no-openssl)	2m 26s
	41m 56s

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