JSDoc `@template` constraint is missing in output

## Search terms

JSDoc type alias constraint

## Steps to reproduce the bug

TypeDoc fails to include the constraint when converting JSDoc `@template` constraints, see https://github.com/microsoft/TypeScript/issues/55619 for details.

## Environment

-   Typedoc version: 0.25.1