minor #29420 [WebProfilerBundle][4.2] Deny messenger <4.2 (ro0NL)

This PR was merged into the 4.2 branch.

Discussion
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[WebProfilerBundle][4.2] Deny messenger <4.2

| Q             | A
| ------------- | ---
| Branch?       | 4.2
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no     <!-- see https://symfony.com/bc -->
| Deprecations? | no
| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->
| Fixed tickets | #29378
| License       | MIT
| Doc PR        | symfony/symfony-docs#... <!-- required for new features -->

together with #29419

Commits
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b335911 [WebProfilerBundle][4.2] Deny messenger <4.2

src/Symfony/Bundle/WebProfilerBundle/composer.json

@@ -32,6 +32,7 @@
     "conflict": {
         "symfony/dependency-injection": "<3.4",
         "symfony/event-dispatcher": "<3.4",
+        "symfony/messenger": "<4.2",
         "symfony/var-dumper": "<3.4"
     },
     "autoload": {