Link to website in mermaid node is not working properly

[AngryNui]

Describe the bug Links in mermaid to external websites won't open when opening .md in collectives. Links in mermaid fail to open new tab when using _blank (also in markdown editor not only in collective).

To Reproduce Steps to reproduce the behavior:

1. Create collective/.md with a mermaid-codeblock and add

   
   %%{init: {'securityLevel':'loose'}}%%
   flowchart
   Nextcloud --> 2 --> 3 ---> Nextcloud

click Nextcloud href "https://nextcloud.com/" _blank

3. Click on the nextcloud-node in mermaid diagram
4. See no external website will open nor a new tab 
5. Go to filebrowser open .md and click on the nextcloud-node in mermaid diagram
6. See external website will load but won't open in a new tab

**Expected behavior**
open new tab with external website when using `_blank` like described in
[Mermaid Docs](https://mermaid.js.org/syntax/flowchart.html#interaction)

**Server details:**
- Collectives app version: [2.9.2]
- Nextcloud version: [28.0.3]

**Client details:**
 - OS: [Windows]
 - Browser: [Firefox]
 - Browser version: [123.0.1]
 - Device: [desktop]

[AngryNui]

same behavior after update

• Collectives app version: [2.10.0]

[AngryNui]

same behavior after update

• Collectives app version: [2.10.1]
• Nextcloud version: [28.0.4]

[AngryNui]

same behavior after update

• Collectives app version: [2.12.0]
• Nextcloud version: [29.0.3]