chore(deps): bump actions/cache from 2.1.5 to 2.1.6

[dependabot[bot]]

Bumps actions/cache from 2.1.5 to 2.1.6.

Release notes

Sourced from actions/cache's releases.

v2.1.6

• Catch unhandled "bad file descriptor" errors that sometimes occurs when the cache server returns non-successful response (actions/cache#596)

Commits

• c64c572 Catch and log unhandled exceptions stemming from closed file descriptor (#596)
• cc2d767 Update Rust directories recommended for caching (#433)
• 2fa955d Update examples.md (#588)
• 3a69637 elixir typo - stray parenthesis (#569)
• 366e5ba Update cache key for Elixir (#568)
• 8d3f2fc Update dependencies (#565)
• See full diff in compare view

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[dependabot[bot]]

Looks like actions/cache is up-to-date now, so this is no longer needed.

[github-actions[bot]]

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