Update dependency rspec-rails to v8

Author: renovate[bot]

Gemfile.lock

@@ -239,7 +239,7 @@ GEM
       thor (~> 1.0)
       zeitwerk (~> 2.5)
     rainbow (3.1.1)
-    rake (13.2.1)
+    rake (13.3.0)
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)