build(deps): bump rack from 2.2.14 to 2.2.18 (#816)

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

Author: dependabot[bot]

Gemfile.lock

@@ -283,7 +283,7 @@ GEM
       activesupport (>= 3.0.0)
     raabro (1.4.0)
     racc (1.8.1)
-    rack (2.2.14)
+    rack (2.2.18)
     rack-session (1.0.2)
       rack (< 3)
     rack-test (2.2.0)