Bump actions/cache from 1 to 2.1.6

[dependabot[bot]]

Bumps actions/cache from 1 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)

v2.1.5

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

v2.1.4

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

v2.1.3

• Upgrades @actions/core to v1.2.6 for CVE-2020-15228. This action was not using the affected methods.
• Fix error handling in uploadChunk where 400-level errors were not being detected and handled correctly

v2.1.2

• Adds input to limit the chunk upload size, useful for self-hosted runners with slower upload speeds
• No-op when executing on GHES

v2.1.1

• Update @actions/cache package to v1.0.2 which allows cache action to use posix format when taring files.

v2.1.0

• Replaces the http-client with the Azure Storage SDK for NodeJS when downloading cache content from Azure. This should help improve download performance and reliability as the SDK downloads files in 4 MB chunks, which can be parallelized and retried independently
• Display download progress and speed

v2.0.0

Initial v2 release

What's new in v2

• Added support for multiple paths (actions/cache#16), glob patterns, and single file caches (actions/cache#33)
• Increased performance and improved cache sizes using zstd for compression for Linux and macOS runners (actions/cache#184)
• Allowed caching for all events with a ref (actions/cache#63)
• Created the @actions/cache npm package to allow other actions to utilize caching (actions/cache#55)
• Added a best-effort step to delete the archive after extraction to reduces storage space (actions/cache#209)

v1.2.0

Bug Fixes

• Fall back to GNU tar on older versions of Windows that do not have BSD tar installed (#252)
• Fixed chunk upload retry logic (#305)

Improvements

• Improved reliability of the download cache APIs (#269)
• Added retries to API calls that failed due to retryable errors (#306)
• Improved error handling during both cache upload (#300) and download (#284)

v1.1.2

Other

... (truncated)

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)
• 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)
• Additional commits viewable in compare view

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