Rich text editor | Update dependency on prosemirror-markdown

[vivinkrishna-ni]

Pull Request

🤨 Rationale

Fixes Bug 2518928: Rich text editor | Bold italics not updating as expected

In markdown-serializer, if the the markdown string contains leading or trailing whitespaces within marks, it will not parsed to an expected rich text content. For example, entering "Bold Italics bold" into the editor, the actual markdown serializer output is **Bold *italics *bold** which renders as below in viewer.

Expected output for the above example should be **Bold *italics* bold**

👩‍💻 Implementation

Bumped the prosemirror-markdown version from 1.11.0 to 1.11.2 which fixes expelEnclosingWhitespace property to expel any leading or trailing whitespaces within a mark to outer nodes.

🧪 Testing

1. Manually tested by getting markdown string for different bold and italics mixed cases and loading it in the viewer.
2. Add test cases in the markdown-serializer.ts for different scenarios with the example mentioned above and a few other test cases that cause the leading and trailing whitespace. Please note that the input HTML string given to the tests is the same as how the Tiptap renders bold and italics cases. For example, strong has a higher priority than italics, so the HTML will be like
   1. Italics between bold (Bold italics bold):

      <strong>
          Bold 
          <em>italics </em>
          bold
      </strong>

   2. Bold between italics (Italics bold italics):

      <em>Italics </em>
      <strong>
           <em>bold </em>
      </strong>
      <em>italics</em>

✅ Checklist

• I have updated the project documentation to reflect my changes or determined no changes are needed.

[rajsite]

You don't need to wait for @m-akinc's review for a straightforward dependency upgrade. We need additional discussion for tests separate from this PR.