build: update to Spring Boot 3.2

[jnodorp-jaconi]

Pull request checklist

Pull request structure

• [x] Make sure you are requesting to pull a topic/feature/bugfix branch (right side). Don't request your main!
• [x] Make sure you are making a pull request against the main branch (left side). Also you should start your branch off our main.
• [x] Check the commits message styles matches our requested structure.

Implementation checks

• [x] Tests for the changes have been added.
• [x] Docs have been reviewed and added / updated if needed.
• [x] Tests (gradle clean check) have passed locally any fixes were made for failures.
• [x] GitHub checks all pass (GH Actions, Sonar, Codecov).

Pull request type

Please check the type of change your PR introduces:

• [ ] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [x] Build related changes
• [ ] Documentation content changes
• [ ] Other (please describe):

Does this introduce a breaking change?

• [x] Yes
• [ ] No

Host mappings do not support ports anymore:

- id: invalid-host-mapping
   uri: https://example.com
   predicates:
     - Host={tenant}.localtest.me:8080

- id: valid-host-mapping
   uri: https://example.com
   predicates:
     - Host={tenant}.localtest.me

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov[bot]]

Codecov Report

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

Project coverage is 86.21%. Comparing base (40211ce) to head (2aa807a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #253 +/- ## ========================================= Coverage 86.21% 86.21% Complexity 123 123 ========================================= Files 27 27 Lines 312 312 Branches 31 31 ========================================= Hits 269 269 Misses 27 27 Partials 16 16 ```

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