Release Core version 1.2.3

[doublnt]

You need to complete

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

[codecov-io]

Codecov Report

Merging #183 into master will increase coverage by 0.03%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #183      +/-   ##
==========================================
+ Coverage   92.63%   92.66%   +0.03%     
==========================================
  Files          62       62              
  Lines        2960     2960              
  Branches      280      280              
==========================================
+ Hits         2742     2743       +1     
  Misses        173      173              
+ Partials       45       44       -1

Flag	Coverage Δ
#unittest	92.66% <ø> (+0.03%)	:arrow_up:

Impacted Files	Coverage Δ
...dk-core/Auth/InstanceProfileCredentialsProvider.cs	100% <0%> (+2.77%)	:arrow_up:

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