add 'micrometer-core' as transitive dependency

[chickenlj]

<dependency>
      <groupId>io.micrometer</groupId>
      <artifactId>micrometer-core</artifactId>
    </dependency>

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.77%. Comparing base (a9e4910) to head (12abb43).

Additional details and impacted files

@@             Coverage Diff              @@
##                3.3   #14872      +/-   ##
============================================
+ Coverage     60.76%   60.77%   +0.01%     
+ Complexity    10866    10864       -2     
============================================
  Files          1882     1882              
  Lines         85983    85983              
  Branches      12876    12876              
============================================
+ Hits          52246    52257      +11     
+ Misses        28289    28283       -6     
+ Partials       5448     5443       -5     

Flag	Coverage Δ
integration-tests	33.00% <ø> (-0.14%)	⬇️
samples-tests	29.21% <ø> (-0.01%)	⬇️
unit-tests	58.93% <ø> (+0.02%)	⬆️

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[songxiaosheng]

why add it

[songxiaosheng]

let me fix it :