Update micrometer dependency and fix test

[objectiser]

Signed-off-by: Gary Brown gary@brownuk.com

Which problem is this PR solving?

Updating the micrometer dependency version.

Short description of the changes

Changed version in build.gradle and fixed a test that fails with the newer version

[codecov]

Codecov Report

Merging #650 into master will increase coverage by 0.24%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #650      +/-   ##
============================================
+ Coverage     89.38%   89.62%   +0.24%     
- Complexity      563      565       +2     
============================================
  Files            69       69              
  Lines          2073     2073              
  Branches        263      263              
============================================
+ Hits           1853     1858       +5     
+ Misses          138      134       -4     
+ Partials         82       81       -1

Impacted Files	Coverage Δ	Complexity Δ
...gertracing/internal/reporters/LoggingReporter.java	90.9% <0%> (+9.09%)	5% <0%> (+1%)	⬆️
...rtracing/internal/reporters/CompositeReporter.java	100% <0%> (+28.57%)	7% <0%> (+1%)	⬆️

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