Bump engine dependency to Spring 6

[tasso94]

Context

The engine currently has a dependency on Spring 5 to allow configuring the engine via an XML file.

Acceptance Criteria (Required on creation)

The dependency is updated to Spring 6.

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1. chore(engine): bump spring-beans to 6 #4862
   bot:java-dependency-check ci:all-as +2
   
2. https://github.com/camunda/camunda-bpm-platform-ee/pull/995
3. chore(docs): add spring 6 info to migration guide camunda-docs-manual#1734
   +0
   

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[mboskamp]

Hey @joaquinfelici, can you share some information/documentation about the changes in those PRs? It's hard to understand why they are necessary.

[joaquinfelici]

Hey @mboskamp , discussed with Tassilo who took care of most of this fix. Spring 5 is EOL, so we're changing the default spring version to 6 for the engine. Spring 5 is still supported but must be explicitly overridden. Websphere Liberty and other impacted distros continue using spring 5, hence the exclusions. The JNDI changes are due to a change in Spring, now the testing library for JNDI was removed, and they propose to add simple-jndi (more info here).

[mboskamp]

I left a few comments/questions in the PRs.