Revert "Bump strong_migrations from 0.7.9 to 0.8.0 (#17504)" (#17540)

This reverts commit f76dd51aa5.

Gemfile

@@ -85,7 +85,7 @@ gem 'simple-navigation', '~> 4.3'
 gem 'simple_form', '~> 5.1'
 gem 'sprockets-rails', '~> 3.4', require: 'sprockets/railtie'
 gem 'stoplight', '~> 2.2.1'
-gem 'strong_migrations', '~> 0.8'
+gem 'strong_migrations', '~> 0.7'
 gem 'tty-prompt', '~> 0.23', require: false
 gem 'twitter-text', '~> 3.1.0'
 gem 'tzinfo-data', '~> 1.2021'

Gemfile.lock

@@ -606,8 +606,8 @@ GEM
     stackprof (0.2.17)
     statsd-ruby (1.5.0)
     stoplight (2.2.1)
-    strong_migrations (0.8.0)
-      activerecord (>= 5.2)
+    strong_migrations (0.7.9)
+      activerecord (>= 5)
     temple (0.8.2)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
@@ -789,7 +789,7 @@ DEPENDENCIES
   sprockets-rails (~> 3.4)
   stackprof
   stoplight (~> 2.2.1)
-  strong_migrations (~> 0.8)
+  strong_migrations (~> 0.7)
   thor (~> 1.2)
   tty-prompt (~> 0.23)
   twitter-text (~> 3.1.0)