Release Core version 1.2.9

[doublnt]

You need to complete

• [ ] unit tests and/or feature tests
• [x] documentation is changed or added

[codecov-io]

Codecov Report

Merging #239 into master will decrease coverage by 0.09%. The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #239     +/-   ##
=========================================
- Coverage   95.84%   95.75%   -0.1%     
=========================================
  Files          64       64             
  Lines        3228     3228             
  Branches      318      318             
=========================================
- Hits         3094     3091      -3     
- Misses         89       91      +2     
- Partials       45       46      +1

Flag	Coverage Δ
#unittest	95.75% <ø> (-0.1%)	:arrow_down:

Impacted Files	Coverage Δ
...uth/Provider/InstanceProfileCredentialsProvider.cs	91.66% <0%> (-8.34%)	:arrow_down:

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