Bump actions/cache from 2 to 2.1.5

[dependabot[bot]]

Bumps actions/cache from 2 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)

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

Commits

• See full diff in compare view

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[codecov[bot]]

Codecov Report

Merging #158 (f51a2bb) into master (96962a4) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #158   +/-   ##
=========================================
  Coverage     85.08%   85.08%           
  Complexity      227      227           
=========================================
  Files            23       23           
  Lines           845      845           
  Branches        100      100           
=========================================
  Hits            719      719           
  Misses           90       90           
  Partials         36       36           

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[mattnworb]

@dependabot ignore this major version

[dependabot[bot]]

OK, I won't notify you about version 2.x.x again, unless you re-open this PR or update to a 2.x.x release yourself.