Fresh install immediately crashes due to missing `javascript_importmap_shim_tag`

[jmdfm]

Fresh installation, with Rails 7.1.2:

undefined local variable or method `javascript_importmap_shim_tag'

I think this is caused by the dependency you have in the .gemspec liberally accepting any version of importmap-rails >=1, and DHH has removed the shim in > 2.0.