Bump coredns to 1.12.3

[thomasferrandiz]

Issue: #12723

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 20.49%. Comparing base (ff6abe8) to head (311f36d).
⚠️ Report is 2 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (ff6abe8) and HEAD (311f36d). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (ff6abe8)	HEAD (311f36d)
e2etests	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #12724       +/-   ##
===========================================
- Coverage   40.72%   20.49%   -20.23%     
===========================================
  Files         184      181        -3     
  Lines       18869    18801       -68     
===========================================
- Hits         7684     3854     -3830     
- Misses      10009    14511     +4502     
+ Partials     1176      436      -740     

Flag	Coverage Δ
e2etests	?
unittests	20.49% <ø> (+<0.01%)	⬆️

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