Add zeitlinger as approver

[jack-berg]

@zeitlinger has been a contributor for several years, and has recently been helping drive the spring boot starter and declarative configuration efforts in opentelemetry-java-instrumentation. Thanks for all your contributions @zeitlinger!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.10%. Comparing base (d576453) to head (a6480b4).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #7868   +/-   ##
=========================================
  Coverage     90.10%   90.10%           
  Complexity     7240     7240           
=========================================
  Files           825      825           
  Lines         21850    21850           
  Branches       2136     2136           
=========================================
  Hits          19688    19688           
  Misses         1496     1496           
  Partials        666      666           

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[breedx-splk]

Nice work @zeitlinger !

[zeitlinger]

Thanks a lot!!!