minor symfony#52404 [Mailer] relax constraints to also run tests with symfony/webhook 6.3 (xabbuh)

This PR was merged into the 6.4 branch.

Discussion
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[Mailer] relax constraints to also run tests with symfony/webhook 6.3

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        |
| License       | MIT

Commits
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c5a2342 relax constraints to also run tests with symfony/webhook 6.3

Author: nicolas-grekas

src/Symfony/Component/Mailer/Bridge/Brevo/composer.json

@@ -21,7 +21,7 @@
     },
     "require-dev": {
         "symfony/http-client": "^6.3|^7.0",
-        "symfony/webhook": "^6.4|^7.0"
+        "symfony/webhook": "^6.3|^7.0"
     },
     "conflict": {
         "symfony/mime": "<6.2"

src/Symfony/Component/Mailer/Bridge/Mailjet/composer.json

@@ -21,7 +21,7 @@
     },
     "require-dev": {
         "symfony/http-client": "^5.4|^6.0|^7.0",
-        "symfony/webhook": "^6.4|^7.0"
+        "symfony/webhook": "^6.3|^7.0"
     },
     "autoload": {
         "psr-4": { "Symfony\\Component\\Mailer\\Bridge\\Mailjet\\": "" },