Bump actions/cache from v2 to v2.1.4

Created by: dependabot[bot]

Bumps actions/cache from v2 to v2.1.4.

Release notes

Sourced from actions/cache's releases.

v2.1.4

• Make caching more verbose #650
• Use GNU tar on macOS if available #701

Commits

• 26968a0 Make save/restore logs akin (#509)
• aeaf731 Use @actions/cache version 1.0.6 (#525)
• 56a8a2f Merge pull request #514 from eregon/recommend-setup-ruby-bundler-cache
• 1bfe3ac Recommend ruby/setup-ruby's bundler-cache: true option
• 3543324 Merge pull request #434 from DanielHabenicht/patch-1
• 3303695 Merge pull request #507 from odin-delrio/patch-1
• e64ab30 Improved gradle cache key calculation example
• 26c48dc Merge pull request #506 from actions/cache-matrix-example
• 72f66cf Added a cache example when using matrix
• 9f3a4d3 Merge pull request #443 from guilleijo/pipenv-example
• Additional commits viewable in compare view

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