Bump sprockets-rails from 3.2.1 to 3.2.2

Bumps sprockets-rails from 3.2.1 to 3.2.2.

Release notes

Sourced from sprockets-rails's releases.

3.2.2

• Fix extending ActionView::Base instances with Sprockets::Rails::Helper on Rails 6.1
• Fix deprecation warning on Ruby 2.7 #454
• action_view/base is no longer required when rake tasks are loaded #455
• Asset not precompiled error exception renamed to AssetNotPrecompiledError #414

Commits

• 1bf94e2 Prepare 3.2.2 release
• 45a1b7a Merge pull request #465 from rails/fix-tests-and-add-ruby-2-7
• 66fd4ab Fix extending ActionView::Base instances
• 3ad8f0d Silence warnings about static path fallback
• fc1badb Fix Action View deprecation warning
• 06b1fdf Require Rails::VERSION so test can run in isolation
• b86310c Fix Sprockets deprecation warning
• c388c28 Only use kwargs splat operator on Ruby 2.7+
• 789c682 Exclude Rails 5.2.x/Ruby 2.2 from build matrix
• ff96fc7 Update ruby version testing matrix
• Additional commits viewable in compare view