[Enhancement]: cleanup document after removing junit4 support

Module

Core

Proposal

cleanup junit limitation for document

details

https://java.testcontainers.org/test_framework_integration/junit_5/

According to the documentation, it still says that a JUnit 4 dependency is required.

Since this module has a dependency onto JUnit Jupiter and on Testcontainers core, which has a dependency onto JUnit 4.x, projects using this module will end up with both, JUnit Jupiter and JUnit 4.x in the test classpath.

However, these changes should have completely removed the dependency on JUnit 4.

• since #970
  • and #10805 ,

Read the JUnit 5 documentation at java.testcontainers.org/test_framework_integration/junit_5/ and compare its JUnit 4 dependency statement with the changes referenced in #970 and #10805. Done means the documentation no longer claims that a JUnit 4 dependency is required if those changes removed it.