Bump spring to 2.7.16

[mslowiak]

PR Checklist

• [ ] Read the contribution guidelines
• [ ] Added a brief description of these changes to the top of the changelog
• [ ] Changes in code meet test criteria (running mvn test returns exit code 0, without errors)

PR Type

• [ ] Bugfix
• [ ] Feature
• [ ] Code style (code formatting, local variable naming)
• [ ] Refactoring (changes that do not affect API nor functionality)
• [x] Build-related
• [x] Documentation
• [ ] Test-related

Summary

Bumping Spring Boot from 2.6.12 to 2.7.16 adds support for JDK 19 and 20. Closes: #261

[mslowiak]

@bglamadrid Spring Boot version is adjusted, and code was tested on JDK 19 and JDK 20. Matrix updated as well 👍

[sonarcloud[bot]]

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