feat: upgrade Spring to v6, SpringBoot to v3

[bednar]

Closes #649

Proposed Changes

Migrate influxdb-spring from Spring Boot v2 to v3, Spring to v6.

Checklist

• [x] CHANGELOG.md updated
• [x] Rebased/mergeable
• [x] mvn test completes successfully
• [x] Commit messages are conventional
• [x] Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (50e1142) 88.35% compared to head (41e8650) 88.33%.

:exclamation: Current head 41e8650 differs from pull request most recent head 82547fb. Consider uploading reports for the commit 82547fb to get more accurate results

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #673 +/- ## ============================================ - Coverage 88.35% 88.33% -0.03% - Complexity 777 779 +2 ============================================ Files 173 173 Lines 7078 7078 Branches 393 389 -4 ============================================ - Hits 6254 6252 -2 Misses 699 699 - Partials 125 127 +2 ```

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