Bump connection_pool from 2.5.4 to 2.5.5 (#593)

Author: dependabot[bot]

Gemfile.lock

@@ -39,7 +39,7 @@ GEM
     climate_control (1.2.0)
     coderay (1.1.3)
     concurrent-ruby (1.3.5)
-    connection_pool (2.5.4)
+    connection_pool (2.5.5)
     date (3.5.0)
     diff-lcs (1.6.2)
     docile (1.4.1)
@@ -181,7 +181,7 @@ CHECKSUMS
   climate_control (1.2.0) sha256=36b21896193fa8c8536fa1cd843a07cf8ddbd03aaba43665e26c53ec1bd70aa5
   coderay (1.1.3) sha256=dc530018a4684512f8f38143cd2a096c9f02a1fc2459edcfe534787a7fc77d4b
   concurrent-ruby (1.3.5) sha256=813b3e37aca6df2a21a3b9f1d497f8cbab24a2b94cab325bffe65ee0f6cbebc6
-  connection_pool (2.5.4) sha256=e9e1922327416091f3f6542f5f4446c2a20745276b9aa796dd0bb2fd0ea1e70a
+  connection_pool (2.5.5) sha256=e54ff92855753df1fd7c59fa04a398833355f27dd14c074f8c83a05f72a716ad
   date (3.5.0) sha256=5e74fd6c04b0e65d97ad4f3bb5cb2d8efb37f386cc848f46310b4593ffc46ee5
   diff-lcs (1.6.2) sha256=9ae0d2cba7d4df3075fe8cd8602a8604993efc0dfa934cff568969efb1909962
   docile (1.4.1) sha256=96159be799bfa73cdb721b840e9802126e4e03dfc26863db73647204c727f21e