Update spring-boot version to 2.6.5

[DanielFran]

---

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• All continuous integration tests are green
• Tests are added where necessary
• The JDL part is updated if necessary
• jhipster-online is updated if necessary
• Documentation is added/updated where necessary
• Coding Rules & Commit Guidelines as per our CONTRIBUTING.md document are followed

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[DanielFran]

Seems that gradle plugin issue is fixed.

[mraible]

@DanielFran Do you know why this upgrade fails?

[DanielFran]

@mraible I identified several issues so far:

• MongoDB is broken, the workaround done by @mshima in previous version do not work anymore
• Couchbase also did not work, maybe @tchlyah can help on this
• Issues with UserService with webflux, after the upgrade it did not return users

[mshima]

Rebased the bom branch for couchbase.

[CLAassistant]

All committers have signed the CLA.

[DanielFran]

@mraible @mshima Everything is green!?!

Will deploy BOM and update repos...

[DanielFran]

@mshima I propose to divide the bug bounty 50/50
Is it OK for you?

[mshima]

@DanielFran sorry the delay. You take 350, I take 150.
You did more here.

[pascalgrimaud]

No @mshima
Take each one 500 plz, you did so much for the project, it's deserved

[DanielFran]

@pascalgrimaud Bug bounty claimed: https://opencollective.com/generator-jhipster/expenses/69653

[pascalgrimaud]

@DanielFran : approved

[mshima]

@pascalgrimaud bounty claimed https://opencollective.com/generator-jhipster/expenses/71472

[pascalgrimaud]

@mshima : approved :)