Update dependency sprockets to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sprockets	'~> 3.7' -> '~> 4.0'

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Release Notes

rails/sprockets (sprockets)

v4.2.1

Compare Source

• Fix for precompile issues when multiple extensions map to the same MIME type (eg. .jpeg / .jpg). #​781
• Fix application/css-sourcemap+json charset #​764
• Fix compatibility with Rack 2 applications. #​790

v4.2.0

Compare Source

• Rack 3 compatibility. #​758
• Fix thread safety of Sprockets::CachedEnvironment and Sprockets::Cache::MemoryStore. #​771
• Add support for Rack 3.0. Headers set by sprockets will now be lower case. #​758
• Make Sprockets::Utils.module_include thread safe on JRuby. #​759
• Fix typo in asset.rb file. #​768

v4.1.1

Compare Source

• Fix Sprockets::Server to return response headers to be compatible with Rack::Lint 2.0.

v4.1.0

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• Allow age to be altered in asset:clean rake task.
• Fix Sprockets::Server to return lower-cased response headers to comply with Rack::Lint 3.0. #​744
• Adding new directive depend_on_directory #​668
• Fix application/js-sourcemap+json charset #​669
• Fix CachedEnvironment caching nil values #​723
• Process *.jst.ejs.erb files with ERBProcessor #​674
• Fix cache key for coffee script processor to be dependent on the filename #​670

v4.0.3

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• Fix Manifest#find yielding from a Promise causing issue on Ruby 3.1.0-dev. #​720
• Better detect the ERB version to avoid deprecation warnings. #​719
• Allow assets already fingerprinted to be served through Sprockets::Server
• Do not fingerprint files that already contain a valid digest in their name
• Remove remaining support for Ruby < 2.4.#​672

v4.0.2

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• Fix etag and digest path compilation that were generating string with invalid digest since 4.0.1.

v4.0.1

Compare Source

• Fix for Ruby 2.7 keyword arguments warning in base.rb. #​660
• Fix for when x_sprockets_linecount is missing from a source map.
• Fix subresource integrity to match the digest of the asset.

v4.0.0

Compare Source

• Fixes for Ruby 2.7 keyword arguments warnings #​625
• Manifest files are sorted alphabetically #​626

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