Bump sprockets from 2.10.1 to 2.12.5

[dependabot[bot]]

Bumps sprockets from 2.10.1 to 2.12.5.

Commits

• d51c58c v2.12.5
• 18b8a7f Do not respond to http requests asking for a file://
• 2199a60 Add test-unit gem
• 18309b0 Test on 2.2
• d487c31 Notify on campfire
• 9937e2d Release 2.12.4
• 4cc0d15 Merge pull request #57 from Shopify/fix-auto-compression
• 6718994 Merge pull request #61 from edward/patch-1
• 3ea46c4 Typo fix
• 0f76ab6 Do not gzip assets that are already gzipped
• Additional commits viewable in compare view

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