Bump concurrent-ruby in /driver/riverqueue-activerecord (#63)

Author: dependabot[bot]

driver/riverqueue-activerecord/Gemfile.lock

@@ -36,7 +36,7 @@ GEM
     ast (2.4.3)
     base64 (0.3.0)
     bigdecimal (4.1.0)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     connection_pool (3.0.2)
     date (3.5.1)
     debug (1.11.1)