[ruby] Upgrade sprockets to version 4.2.0

[depfu]

Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ sprockets (<= 4.0.3 → <= 4.2.0) · Repo · Changelog

Release Notes

4.2.0 (from changelog)

• 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

Does any of this look wrong? Please let us know.

Commits

See the full diff on Github. The new version differs by 27 commits:

• Prepare for 4.2.0
• Merge pull request #771 from eregon/thread-safe-CachedEnvironment
• Make the URI tests pass with ruby-head
• Add TruffleRuby in CI
• Add ChangeLog entry
• Make Sprockets::Cache::MemoryStore thread-safe by using a Mutex
• Use Concurrent::Map#fetch_or_store
• Make Sprockets::CachedEnvironment thread-safe by using Concurrent::Map
• Merge pull request #759 from ntkme/module-include-thread-safety
• Make Sprockets::Utils.module_include thread safe
• Merge pull request #758 from lsylvester/rack-3-support
• update changelog entry to make it explict that the headers will change
• unsure that we are using a version of rack that supports lower case headers
• Add Changelog entry
• lower case headers
• require rack/lint
• relax rack
• bump version of rack-test to allow for rack-3
• Merge pull request #754 from benkoshy/patch-1
• Merge pull request #757 from benkoshy/patch-4
• Merge pull request #756 from benkoshy/patch-2
• fix typo
• fix: grammar
• Update building_an_asset_processing_framework.md
• Merge pull request #751 from ursm/patch-1
• Fix class name in sample code
• Fix engine link documentation

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