Downgrade importmap-rails to 1.2

v2.0.1 down not fire turbo:load event in test env, which causes tests to
fail.
Issue reported: https://github.com/rails/importmap-rails/issues/233

Gemfile

@@ -12,7 +12,7 @@ gem "devise"
 
 gem 'awesome_nested_set'
 
-gem 'importmap-rails'
+gem 'importmap-rails', '~> 1.2.3'
 # turborails >= 2.0.0 required with npm v8.0.0 with support for [autofocus]
 # attribute in turbo-streams
 gem 'turbo-rails', '> 1.5.0'

Gemfile.lock

@@ -112,7 +112,7 @@ GEM
       activesupport (>= 6.1)
     i18n (1.14.1)
       concurrent-ruby (~> 1.0)
-    importmap-rails (2.0.1)
+    importmap-rails (1.2.3)
       actionpack (>= 6.0.0)
       activesupport (>= 6.0.0)
       railties (>= 6.0.0)
@@ -255,7 +255,7 @@ DEPENDENCIES
   byebug
   capybara
   devise
-  importmap-rails
+  importmap-rails (~> 1.2.3)
   mysql2 (~> 0.5)
   puma (~> 6.0)
   rails (~> 7.1.2)

test/system/units_test.rb

@@ -24,7 +24,7 @@ class UnitsTest < ApplicationSystemTestCase
       fill_in 'unit[name]',
         with: [nil, SecureRandom.alphanumeric(rand(1..maxlength['unit[name]']))].sample
       assert_difference ->{ Unit.count }, 1 do
-        click_on t(:add)
+        click_on t('helpers.submit.create')
       end
     end