fix: use different default port

[pihme]

Description

Changes the default port in order to not conflict with a Zeebe instance running on the same port.

(does not address the request to make the port configurable)

Related issues

relates to #366

Definition of Done

Not all items need to be done depending on the issue and the pull request.

Code changes:

• The changes are backwards compatibility with previous versions
• If it fixes a bug then PRs are created to backport the fix

Testing:

• There are unit/integration tests that verify all acceptance criterias of the issue
• New tests are written to ensure backwards compatibility with further versions
• The behavior is tested manually

Documentation:

• Javadoc has been written
• The documentation is updated

[github-actions]

Unit Test Results

  44 files    44 suites   1m 18s ⏱️
104 tests 104 ✔️ 0 💤 0 ❌
331 runs  331 ✔️ 0 💤 0 ❌

Results for commit 3d2b6c1.

[saig0]

@pihme LGTM 👍