Bump rack from 3.1.15 to 3.1.16 (#1089)

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -420,7 +420,7 @@ GEM
       activesupport (>= 3.0.0)
     raabro (1.4.0)
     racc (1.8.1)
-    rack (3.1.15)
+    rack (3.1.16)
     rack-cors (3.0.0)
       logger
       rack (>= 3.0.14)