Merge branch 'perf/scope-and-breadcrumb-shallow-dup' into perf/reduce-memory-allocations

# Conflicts:
#	sentry-ruby/lib/sentry/scope.rb

Author: HazAT

sentry-ruby/lib/sentry/scope.rb

@@ -124,8 +124,8 @@ def clear_breadcrumbs
     def dup
       copy = super
       copy.breadcrumbs = breadcrumbs.dup
-      # contexts contains os/runtime (class-level frozen hashes) — shallow dup of outer hash is sufficient
-      # since inner hashes are not mutated after being set
+      # Shallow dup is sufficient for these containers — inner values are not
+      # mutated after scope duplication, only replaced via merge! or assignment
       copy.contexts = contexts.dup
       copy.extra = extra.dup
       copy.tags = tags.dup