Backticked strings with `<` or `>` are not properly displayed

[maraino]

Describe the bug GitHub issues or pull requests with "backticked" strings with < or >, like map<string,string> are printed in Slack as mapstringstring.

To Reproduce Steps to reproduce the behavior:

1. Create an issue with map<string,string>
2. Paste the issue in Slack
3. mapstring,string is displayed instead.

Expected behavior It should show map<string,string>

Screenshots N/A

Desktop (please complete the following information):

• OS: macOS
• Browser: any, including app
• Version: any

Smartphone (please complete the following information): N/A

Additional context N/A