CODE_OF_CONDUCT.md: fix redirect (#32033)

CODE_OF_CONDUCT.md

@@ -40,7 +40,4 @@ Project maintainers who do not follow or enforce the Code of Conduct in good fai
 
 ## Attribution
 
-This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4, available at [https://www.contributor-covenant.org/version/1/4/code-of-conduct.html][version]
-
-[homepage]: https://www.contributor-covenant.org/
-[version]: https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+This Code of Conduct is adapted from the [Contributor Covenant](https://www.contributor-covenant.org/), version 1.4, available at <https://www.contributor-covenant.org/version/1/4/code-of-conduct/>