bug symfony#59486 [Validator] Update sr_Cyrl 120:This value is not a valid slug. (kaznovac)

This PR was merged into the 6.4 branch.

Discussion
----------

[Validator] Update sr_Cyrl 120:This value is not a valid slug.

inline with the tone and terminology of the rest of the translations

| Q             | A
| ------------- | ---
| Branch?       | 6.4 <!-- see below -->
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Issues        | Fix symfony#59427 <!-- prefix each issue number with "Fix #", no need to create an issue if none exists, explain below instead -->
| License       | MIT

<!--
Replace this notice by a description of your feature/bugfix.
This will help reviewers and should be a good start for the documentation.

Additionally (see https://symfony.com/releases):
 - Always add tests and ensure they pass.
 - Bug fixes must be submitted against the lowest maintained branch where they apply
   (lowest branches are regularly merged to upper ones so they get the fixes too).
 - Features and deprecations must be submitted against the latest branch.
 - For new features, provide some code snippets to help understand usage.
 - Changelog entry should follow https://symfony.com/doc/current/contributing/code/conventions.html#writing-a-changelog-entry
 - Never break backward compatibility (see https://symfony.com/bc).
-->

Commits
-------

aed5cd6 [Validator] Update sr_Cyrl 120:This value is not a valid slug.

Author: fabpot

src/Symfony/Component/Validator/Resources/translations/validators.sr_Cyrl.xlf

@@ -468,7 +468,7 @@
             </trans-unit>
             <trans-unit id="120">
                 <source>This value is not a valid slug.</source>
-                <target state="needs-review-translation">Ова вредност није важећи слуг.</target>
+                <target>Ова вредност није валидан слуг.</target>
             </trans-unit>
         </body>
     </file>