chore(deps): update actions/cache action to v1.2.0

[renovate]

This PR contains the following updates:

Package	Update	Change
actions/cache	minor	v1.1.0 -> v1.2.0

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Release Notes

actions/cache

v1.2.0

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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

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Other

Updating action name back to "Cache" to fix the marketplace links (https://github.com/marketplace/actions/cache)

v1.1.1

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Improvements

• Increase cache size limit to 5 GB (#​168)
• Add proxy support (#​166)

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