minor #17252 Updated SymfonyCloud link (b1n01)

This PR was merged into the 4.4 branch.

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Updated SymfonyCloud link

Fixing the URL to the SymfonyCloud environment variables documentation page

Commits
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4046869 Updated SymfonyCloud link

Author: javiereguiluz

configuration.rst

@@ -955,4 +955,4 @@ And all the other topics related to configuration:
 .. _`Learn the XML syntax`: https://en.wikipedia.org/wiki/XML
 .. _`environment variables`: https://en.wikipedia.org/wiki/Environment_variable
 .. _`symbolic links`: https://en.wikipedia.org/wiki/Symbolic_link
-.. _`utilities to manage env vars`: https://symfony.com/doc/master/cloud/cookbooks/env.html
+.. _`utilities to manage env vars`: https://symfony.com/doc/current/cloud/env.html