chore: change default port from 9999 to 8086

[rhajek]

Closes #147

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• mvn test completes successfully
• Commit messages are in semantic format
• Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

Merging #148 into master will decrease coverage by 0.55%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #148      +/-   ##
============================================
- Coverage     90.94%   90.38%   -0.56%     
  Complexity      441      441              
============================================
  Files           137      137              
  Lines          5388     5388              
  Branches        206      206              
============================================
- Hits           4900     4870      -30     
- Misses          412      441      +29     
- Partials         76       77       +1     

Impacted Files	Coverage Δ	Complexity Δ
...nfluxdb/client/internal/ScraperTargetsApiImpl.java	80.76% <0.00%> (-19.24%)	0.00% <0.00%> (ø%)
.../influxdb/client/internal/AbstractWriteClient.java	89.57% <0.00%> (-1.90%)	0.00% <0.00%> (ø%)
...a/com/influxdb/client/internal/BucketsApiImpl.java	78.76% <0.00%> (-0.69%)	0.00% <0.00%> (ø%)

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