Bump actions/cache from 2.1.4 to 2.1.5

Created by: dependabot[bot]

Bumps actions/cache from 2.1.4 to 2.1.5.

Release notes

Sourced from actions/cache's releases.

v2.1.5

• Fix permissions error seen when extracting caches with GNU tar that were previously created using BSD tar (actions/cache#527)

Commits

• 1a9e213 Update cache module to v1.0.7 (#562)
• 981fa98 Merge pull request #469 from ericmj/patch-1
• 4498c5b Drop the example based on using pip's internals (#519)
• 4134e6d It is not recommended to cache node_modules (#537)
• 62a4d75 Also cache _build for Elixir
• See full diff in compare view

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