ZJIT: SystemStackError in TestOpenURI and TestOpenURISSL

[k0kubun]

We've seen a lot of random test failures in these test classes on ZJIT Ubuntu:
https://github.com/ruby/ruby/actions/runs/23744822838/job/69170651311
https://github.com/ruby/ruby/actions/runs/23742555627/job/69162959901
https://github.com/ruby/ruby/actions/runs/23725956698/job/69109422210
https://github.com/ruby/ruby/actions/runs/23686233231/job/69006077511
https://github.com/ruby/ruby/actions/runs/23685965745/job/69005383732
https://github.com/ruby/ruby/actions/runs/23685965745/job/69005383727
https://github.com/ruby/ruby/actions/runs/23669351599/job/68959067937
https://github.com/ruby/ruby/actions/runs/23668044805/job/68954861076
https://github.com/ruby/ruby/actions/runs/23661130621/job/68931376411
https://github.com/ruby/ruby/actions/runs/23659034323/job/68924061758
https://github.com/ruby/ruby/actions/runs/23659034323/job/68924061773
https://github.com/ruby/ruby/actions/runs/23630483603/job/68828558045

We skipped them for now ruby#16603, but we should unskip them.