Update dependency scout_apm to v6

Author: renovate[bot]

Gemfile.lock

@@ -276,7 +276,7 @@ GEM
       activerecord (>= 6.1)
       request_store (~> 1.4)
     parallel (1.27.0)
-    parser (3.3.9.0)
+    parser (3.3.10.0)
       ast (~> 2.4.1)
       racc
     pg (1.6.2)
@@ -387,7 +387,7 @@ GEM
       sprockets (> 3.0)
       sprockets-rails
       tilt
-    scout_apm (5.7.1)
+    scout_apm (6.0.0)
       parser
     securerandom (0.4.1)
     selectize-rails (0.12.6)