fix: add docker-java.properties so that generated test code works with the recent version of Docker

[sekikn]

Description

• This PR adds docker-java.properties which specifies Docker client version explicitly so that the generated code using Testcontainers works with the recent version of Docker (29.0.0+). Upgrading Testcontainers to 2.0.2+ is a straightforward solution, but it introduces incompatible API change and will take some time to address. So this PR uses an alternative workaround. I tested it as follows:

$ npm t -- --runInBand

...

Test Suites: 6 passed, 6 total
Tests:       11 passed, 11 total
Snapshots:   51 passed, 51 total
Time:        4.829 s, estimated 11 s
Ran all test suites.

$ asyncapi generate fromTemplate tests/mocks/kafka.yml . -o /tmp/kafka
┌  AsyncAPI Generator
│
◇  Check out your shiny new generated files at /tmp/kafka.

$ cd /tmp/kafka
$ chmod +x gradlew
$ ./gradlew test --tests com.asyncapi.TestcontainerKafkaTest

...

BUILD SUCCESSFUL in 7s
5 actionable tasks: 1 executed, 4 up-to-date

• It also incorporates fix: remove max generator version #442 to make the existing tests pass.

Related issue(s)

Resolves #455

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