Update rspec-mocks

We ran

   bundle update --conservative rspec-mocks

We need to update rspec-mocks here since Rails 7.1 introduces a method
`with` that clashes with the `with` method provided by
rspec-mocks[1]. We're using the latter in the corp_middleware_spec.

[1] rspec/rspec-mocks#1530

Co-authored-by: Chris Roos <chris.roos@gofreerange.com>

Gemfile.lock

@@ -364,7 +364,7 @@ GEM
     rspec-expectations (3.12.2)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.12.0)
-    rspec-mocks (3.12.3)
+    rspec-mocks (3.12.7)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.12.0)
     rspec-rails (6.0.1)