fix: lonely additionalProperties not interpreted as dictionary

[jonaslagoni]

Description

This PR fixes that lonely additionalProperties not interpreted as dictionary.

Related Issue

Fixes #1977

[netlify]

✅ Deploy Preview for modelina canceled.

Name	Link
🔨 Latest commit	dabfd2c
🔍 Latest deploy log	https://app.netlify.com/sites/modelina/deploys/6630c0f65626ce0008333ad4

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity 😴

It will be closed in 120 days if no further activity occurs. To unstale this pull request, add a comment with detailed explanation.

There can be many reasons why some specific pull request has no activity. The most probable cause is lack of time, not lack of interest. AsyncAPI Initiative is a Linux Foundation project not owned by a single for-profit company. It is a community-driven initiative ruled under open governance model.

Let us figure out together how to push this pull request forward. Connect with us through one of many communication channels we established here.

Thank you for your patience ❤️