Enable more frozen string in lib/**/*.rb

Enables frozen for the following:

* lib/*.rb
* lib/banzai/**/*.rb
* lib/bitbucket/**/*.rb
* lib/constraints/**/*.rb
* lib/container_registry/**/*.rb
* lib/declarative_policy/**/*.rb

Partially addresses #47424.

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/backup.rb b/lib/backup.rb
index e2c62af23ae..2712b33b4b4 100644
--- a/lib/backup.rb
+++ b/lib/backup.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Backup
   Error = Class.new(StandardError)
 end