fix(deployer): avoid GitHub mentions (#12429)

* fix(deployer): avoid GitHub mentions

`redirect.github.com` is also used by Dependabot for the same purpose.

* fix(deployer): keep original url as link text

* style(black): run `black deployer/src`

deployer/src/deployer/analyze_pr.py

@@ -171,9 +171,15 @@ def post_about_dangerous_content(
             external_urls_list = []
             for url in sorted(external_urls):
                 count = external_urls[url]
+                # Avoid GitHub mentions.
+                original_url = url
+                url = url.replace("https://github.com/", "https://redirect.github.com/")
+                link = (
+                    f"<{url}>" if url == original_url else f"[{original_url}](<{url}>)"
+                )
                 line = (
                     f"  - {'🚨 ' if url.startswith('http://') else ''}"
-                    f"<{url}> ({count} time{'' if count==1 else 's'})"
+                    f"{link} ({count} time{'' if count == 1 else 's'})"
                 )
                 if diff_lines:
                     # If this was available and it _did_ fine a URL, then