chore: update middleman-sprockets requirement from = 4.0.0 to = 4.1.1

[dependabot]

Updates the requirements on middleman-sprockets to permit the latest version.

Changelog

Sourced from middleman-sprockets's changelog.

4.1.1

fixes

• support sprockets renderable proxied assets, fixes #128 related to how the I18n extension moves assets.

4.1.0

fixes

• respect http_prefix in asset_path helper @​vvasabi

features

• allow passing proc/class to imported_asset_path option to determine imported asset location @​vvasabi

4.0.0

This is a major rewrite focussed on adding support for Sprockets 3+ & Middleman 4+. With this come a lot of changes, please read the upgrade guide for more information:

tl;dr;

• Requires Middleman 4.0+ & Sprockets 3.0+
• Remove auto-activation
• Remove the import_asset helper, assets should be linked via a manifest file
• Remove "automagical" asset placement, linked assets all go in the imported_asset_path option
• Add option to expose middleman helpers to sprockets assets
• Add compatability for SassC if using Sprockets 4+

3.4.2

• Add Woff2 support.

3.3.2

• Remove file-based cache (.cache folder), which did not invalidate correctly and led to a lot of problems with assets not updating.
• It is now possible to configure Sprockets via sprockets.append_path and sprockets.import_asset without having to wrap it in a ready block.

3.3.1

• Fix import_asset for Bower and other import paths that don't end in /javascripts, /stylesheets, etc.

3.3.0

• Prep work for Middleman v4.

... (truncated)

Commits

• 5e5197c 4.1.1
• 32e738a fix() ensure ignored assets are ignored with respect to proxies
• 85d0396 feat() support sprockets rendering of proxied assets
• 5b6202a chore(deps): bump ruby versions in travis.yml
• 9b77b2b chore(deps): remove ruby 2.0 & 2.1 from CI, middleman dropped support
• d70a24f feat(contributing): add issue template
• 0d1609f 4.1.0
• 1921952 feat(import_asset_path): consolidate path prefix & processor to one config op...
• 299abd4 refactor(asset_path#http_prefix): rework to use File.join & array.compact
• 24cb47c refactor(http_prefix_test): use existing fixture application
• Additional commits viewable in compare view

[JC-DSIT]

@dependabot rebase