bump datadog-ci dependency to 0.6.0

[anmarchenko]

What does this PR do?
Bumps datadog-ci dependency to 0.6.0. Please see full release notes here.

Motivation:
New datadog-ci version is released.

How to test the change?

Projects used for integration testing:

https://github.com/anmarchenko/devdocs
https://github.com/anmarchenko/rubocop
https://github.com/anmarchenko/jekyll
https://github.com/anmarchenko/openstreetmap-website
https://github.com/anmarchenko/feedbin
https://github.com/anmarchenko/vagrant

For Datadog employees:

• If this PR touches code that signs or publishes builds or packages, or handles
  credentials of any kind, I've requested a review from @DataDog/security-design-and-guidance.
• This PR doesn't touch any of that.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (28dc187) 98.23% compared to head (b5b7cfb) 98.23%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3361      +/-   ##
==========================================
- Coverage   98.23%   98.23%   -0.01%     
==========================================
  Files        1253     1253              
  Lines       73039    73039              
  Branches     3431     3431              
==========================================
- Hits        71752    71750       -2     
- Misses       1287     1289       +2     

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[ivoanjo]

👍 LGTM