build(deps): bump concurrent-ruby from 1.3.6 to 1.3.7 in /auth0_flutter/example/ios (#877)

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

Author: dependabot[bot]

auth0_flutter/example/ios/Gemfile.lock

@@ -22,7 +22,7 @@ GEM
     claide (1.1.0)
     clamp (1.3.2)
     colored2 (3.1.2)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     connection_pool (3.0.2)
     drb (2.2.3)
     i18n (1.14.8)