Runtime error with tabs markup

### Package version

_No response_

### Node version

_No response_

### Platform

_No response_

### What steps will reproduce the bug?

Go to diplodoc playground: https://diplodoc-platform.github.io/playground/

Paste this markup:

```md
{% list tabs %}

- tab1

{% endlist %}

{% endlist %}
```

[Example](https://diplodoc-platform.github.io/playground/?mode=preview&input=%257B%2525%2520list%2520tabs%2520%2525%257D%250A%250A%2520%2520-%2520tab1%250A%250A%2520%2520%2520%2520%257B%2525%2520endlist%2520%2525%257D%250A%250A%257B%2525%2520endlist%2520%2525%257D%250A)

### What is the expected behavior?

md-markup will be rendered in HTML

### What do you see instead?

Runtime error

```
TypeError: token.attrPush is not a function
at exports6.addAttrs (utils.js:126:13)
at Object.transform (patterns.js:206:15)
at Array.curlyAttrs (index.js:30:19)
at Core.process (parser_core.js:54:12)
at MarkdownIt3.parse (index.js:524:13)
at md.ts:133:25
at transform3 (index.ts:42:35)
at generateHTML (generators.ts:59:12)
```

### Additional information

_No response_