Update actions/cache action to v2.1.6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/cache	action	patch	v2.1.5 -> v2.1.6

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Release Notes

actions/cache

v2.1.6

Compare Source

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

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[codecov]

Codecov Report

Merging #344 (a146eae) into main (0493ae5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #344   +/-   ##
=======================================
  Coverage   96.32%   96.32%           
=======================================
  Files           6        6           
  Lines         272      272           
=======================================
  Hits          262      262           
  Misses         10       10           

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