minor symfony#21419 [Logger] Update link to Monolog Configuration class for v4 (GromNaN)

This PR was merged into the 7.4 branch.

Discussion
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[Logger] Update link to Monolog Configuration class for v4

Follows symfony#21416

`symfony/monolog-bundle: ^4` will be the only version supporting Symfony 8.

Commits
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5330b20 Update Monolog branch

Author: javiereguiluz

logging.rst

@@ -420,5 +420,5 @@ Learn more
 .. _`Monolog`: https://github.com/Seldaek/monolog
 .. _`LoggerInterface`: https://github.com/php-fig/log/blob/master/src/LoggerInterface.php
 .. _`logrotate`: https://github.com/logrotate/logrotate
-.. _`Monolog Configuration`: https://github.com/symfony/monolog-bundle/blob/3.x/src/DependencyInjection/Configuration.php
+.. _`Monolog Configuration`: https://github.com/symfony/monolog-bundle/blob/4.x/src/DependencyInjection/Configuration.php
 .. _`STDERR PHP stream`: https://www.php.net/manual/en/features.commandline.io-streams.php

reference/configuration/monolog.rst

@@ -30,4 +30,4 @@ in your application configuration.
     messages in the profiler. The profiler uses the name "debug" so it
     is reserved and cannot be used in the configuration.
 
-.. _`Monolog Configuration`: https://github.com/symfony/monolog-bundle/blob/3.x/src/DependencyInjection/Configuration.php
+.. _`Monolog Configuration`: https://github.com/symfony/monolog-bundle/blob/4.x/src/DependencyInjection/Configuration.php