minor #19022 Fix the installation instructions of symfony/psr-http-message-bridge (javiereguiluz)

This PR was merged into the 5.4 branch.

Discussion
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Fix the installation instructions of symfony/psr-http-message-bridge

Fixes #19018.

When upmerging to 6.3, we'll keep this change. In 6.4 and 7.0 we'll remove it.

Commits
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1c9dc63 Fix the installation instructions of symfony/psr-http-message-bridge

Author: javiereguiluz

components/psr7.rst

@@ -10,7 +10,7 @@ Installation
 
 .. code-block:: terminal
 
-    $ composer require symfony/psr-http-message-bridge
+    $ composer require symfony/psr-http-message-bridge:^2.3
 
 .. include:: /components/require_autoload.rst.inc