libcurl/_competitors.html: fix the CPR link

Author: bagder

libcurl/_competitors.html

@@ -37,7 +37,7 @@
   asynchronous model of Boost.Asio.
 </li></ul>
 
-<b><a href="https://docs.libcpr.org/">CPR</a></b> (MIT)
+<b><a href="https://docs.libcpr.dev/">CPR</a></b> (MIT)
 <ul><li>
   C++ Requests: curl for People, a spiritual port of Python Requests. (based on libcurl)
 </li></ul>