Update CI URLs to point to new caching infrastructure

[staticfloat]

Hello there!
This is an automated pull request submitted by @staticfloat to help package authors transition their Julia installation CI setups to the new binary provider URL. Please take a look at this PR, and if there is a problem or it doesn't download correctly when CI runs, feel free to ping @staticfloat

[coveralls]

Coverage remained the same at 100.0% when pulling 7ca4c2c on staticfloat:updated_ci_url into 80e2eb1 on tlycken:master.

[coveralls]

Coverage remained the same at 100.0% when pulling 7ca4c2c on staticfloat:updated_ci_url into 80e2eb1 on tlycken:master.

[codecov-io]

Codecov Report

Merging #1 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master     #1   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          35     35           
=====================================
  Hits           35     35

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