Merge pull request rails#42902 from yahonda/digest301pre

Address `bundle exec blade build` failure with ruby 3.1.0dev

Author: byroot

Gemfile

@@ -176,6 +176,9 @@ if RUBY_VERSION >= "3.1"
   gem "net-imap", require: false
   gem "net-pop", require: false
 
+  # digest gem, which is one of the default gems has bumped to 3.0.1.pre for ruby 3.1.0dev.
+  gem "digest", "~> 3.0.1.pre", require: false
+
   # matrix was removed from default gems in Ruby 3.1, but is used by the `capybara` gem.
   # So we need to add it as a dependency until `capybara` is fixed: https://github.com/teamcapybara/capybara/pull/2468
   gem "matrix", require: false