minor #1156 Add "dev" keyword to symfony/ux package (nicolas-grekas)

This PR was merged into the 2.x branch.

Discussion
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Add "dev" keyword to symfony/ux package

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| Tickets       | -
| License       | MIT

Same as symfony/symfony#51811

Even if symfony/ux is not registered on packagist, I'm doing this for completeness and consistency among all our meta-repositories.

Commits
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c42a666 Add "dev" keyword to symfony/ux package

composer.json

@@ -1,6 +1,7 @@
 {
     "name": "symfony/ux",
     "license": "MIT",
+    "keywords": ["dev"],
     "require-dev": {
         "symfony/filesystem": "^5.2|^6.0",
         "symfony/finder": "^5.4|^6.0",