fix(deps): update dependency @actions/cache to v2.0.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@actions/cache	2.0.5 -> 2.0.6

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Release Notes

actions/toolkit

v2.0.6

• Fix Tar failed with error: The process '/usr/bin/tar' failed with exit code 1 issue when temp directory where tar is getting created is actually the subdirectory of the path mentioned by the user for caching. (issue)

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