The preview of GitHub Issue URL does not properly escape angle brackets

[mame]

Describe the bug
When a GitHub Issue has a string like <foo> in the code block, it is not properly escaped in the issue's Slack preview.

To Reproduce
Steps to reproduce the behavior:

1. Paste this URL to any Slack workspace (with GitHub integration enabled)
2. See only bar, instead of <foo|bar>

Expected behavior
I expect <foo|bar> to be shown.

Screenshots

Note that the bar is a link to URL foo.

Desktop (please complete the following information):

• OS: Windows 11
• Browser: Chrome
• Version: Windows Store 4.37.101 64-bit

Additional context
I have contacted on the GitHub security and have received prior permission to create this public issue here.