chore: resolve open dependabot security alerts

- concurrent-ruby 1.3.6 -> 1.3.7 (high/low, alerts #13, #14, #15, #16)

Signed-off-by: Jonathan Norris <jonathan.norris@dynatrace.com>

Author: jonathannorris

Gemfile.lock

@@ -10,7 +10,7 @@ GEM
     base64 (0.3.0)
     bigdecimal (4.1.1)
     builder (3.3.0)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     csv (3.3.5)
     cucumber (11.0.0)
       base64 (~> 0.2)