minor #18384 Fix Cmder broken link (Thibault Miscoria)

This PR was merged into the 5.4 branch.

Discussion
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Fix Cmder broken link

Update Cmder link

Commits
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0133950 Fix Cmder broken link

Author: javiereguiluz

contributing/code/tests.rst

@@ -65,7 +65,7 @@ what's going on and if the tests are broken because of the new code.
     to see colored test results.
 
 .. _`install Composer`: https://getcomposer.org/download/
-.. _Cmder: https://cmder.net/
+.. _Cmder: https://cmder.app/
 .. _ConEmu: https://conemu.github.io/
 .. _ANSICON: https://github.com/adoxa/ansicon/releases
 .. _Mintty: https://mintty.github.io/