Adapt influxdb-spring to Spring Boot 4 actuator package refactoring

[ChildrenGreens]

Description

Spring Boot 4 introduced breaking changes in actuator-related package names
(e.g. org.springframework.boot.actuate.health → org.springframework.boot.health).

This PR updates influxdb-spring to adapt to the new package structure so it can be used with Spring Boot 4.

Changes

• Update actuator-related imports for Spring Boot 4 compatibility

Compatibility

• This change targets Spring Boot 4.x
• Existing behavior for earlier Spring Boot versions is not affected (if applicable)

Please let me know if you prefer a different compatibility strategy.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.81%. Comparing base (e2fbb3a) to head (c04cda0).
⚠️ Report is 6 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff            @@
##             master     #850   +/-   ##
=========================================
  Coverage     88.81%   88.81%           
+ Complexity      791      789    -2     
=========================================
  Files           174      174           
  Lines          7250     7250           
  Branches        413      413           
=========================================
  Hits           6439     6439           
  Misses          680      680           
  Partials        131      131           

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