Merge branch '237841-increase-rspec-migration-jobs-parallelization' into 'master'

ci: Increase the parallelization of the RSpec migration jobs

See merge request gitlab-org/gitlab!58925

.gitlab/ci/rails.gitlab-ci.yml

@@ -113,10 +113,10 @@
 ############################
 # rspec job parallel configs
 .rspec-migration-parallel:
-  parallel: 5
+  parallel: 7
 
 .rspec-ee-migration-parallel:
-  parallel: 2
+  parallel: 3
 
 .rspec-unit-parallel:
   parallel: 20