Update GE plugin in examples to 3.6.1

[kiview]

This aligns the version between the examples and the project.

It is further a blind-fix to check if this solves:

Settings file '/home/runner/work/testcontainers-java/testcontainers-java/examples/settings.gradle' line: 14

* What went wrong:
A problem occurred evaluating settings 'examples'.
> Failed to apply plugin 'com.gradle.enterprise'.
   > Failed to parse GRADLE_ENTERPRISE_ACCESS_KEY environment variable: value is malformed (expected format: 'server-host=access-key').