Bump rspec from 3.8.0 to 3.12.0

Bumps [rspec](https://github.com/rspec/rspec-metagem) from 3.8.0 to 3.12.0.
- [Commits](rspec/rspec-metagem@v3.8.0...v3.12.0)

---
updated-dependencies:
- dependency-name: rspec
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -3,24 +3,24 @@ GEM
   specs:
     coderay (1.1.2)
     colorize (0.8.1)
-    diff-lcs (1.3)
+    diff-lcs (1.5.0)
     method_source (0.9.2)
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
-    rspec (3.8.0)
-      rspec-core (~> 3.8.0)
-      rspec-expectations (~> 3.8.0)
-      rspec-mocks (~> 3.8.0)
-    rspec-core (3.8.0)
-      rspec-support (~> 3.8.0)
-    rspec-expectations (3.8.3)
+    rspec (3.12.0)
+      rspec-core (~> 3.12.0)
+      rspec-expectations (~> 3.12.0)
+      rspec-mocks (~> 3.12.0)
+    rspec-core (3.12.2)
+      rspec-support (~> 3.12.0)
+    rspec-expectations (3.12.3)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-mocks (3.8.0)
+      rspec-support (~> 3.12.0)
+    rspec-mocks (3.12.6)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-support (3.8.0)
+      rspec-support (~> 3.12.0)
+    rspec-support (3.12.1)
 
 PLATFORMS
   ruby