@releng Update `com.adobe.commerce.cif.graphql-client` dependency to version `1.6.0`

[dplaton]

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes and the overall coverage did not decrease.
• [ ] All unit tests pass on CircleCi.
• [ ] I ran all tests locally and they pass.

[herzog31]

Don't forget about https://github.com/adobe/commerce-cif-connector/blob/master/.circleci/ci/it-tests.js#L35.

[codecov[bot]]

Codecov Report

Merging #133 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #133   +/-   ##
=========================================
  Coverage     87.45%   87.45%           
  Complexity      495      495           
=========================================
  Files            35       35           
  Lines          1905     1905           
  Branches        293      293           
=========================================
  Hits           1666     1666           
  Misses          106      106           
  Partials        133      133           

Flag	Coverage Δ	Complexity Δ
#integration	48.91% <ø> (ø)	253.00 <ø> (ø)
#karma	92.71% <ø> (ø)	0.00 <ø> (ø)
#unittests	83.86% <ø> (ø)	479.00 <ø> (ø)

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