chore(deps): update dependency rack to v3.2.1

Author: renovate[bot]

example/animal-service/Gemfile.lock

@@ -51,7 +51,7 @@ GEM
     pry (0.15.2)
       coderay (~> 1.1)
       method_source (~> 1.0)
-    rack (3.1.16)
+    rack (3.2.1)
     rack-protection (4.1.1)
       base64 (>= 0.1.0)
       logger (>= 1.6.0)

example/zoo-app/Gemfile.lock

@@ -66,7 +66,7 @@ GEM
     pry (0.15.2)
       coderay (~> 1.1)
       method_source (~> 1.0)
-    rack (3.1.16)
+    rack (3.2.1)
     rack-test (2.1.0)
       rack (>= 1.3)
     rackup (2.2.1)