minor symfony#61260 Leverage symfony-tools/fabbot (nicolas-grekas)

This PR was merged into the 6.4 branch.

Discussion
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Leverage symfony-tools/fabbot

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

Follows symfony#61256
Having fabbot in another repo allows proper referencing of the workflow. This is especially important for repositories that are not symfony/symfony

Commits
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42a44ac Leverage symfony-tools/fabbot

Author: nicolas-grekas

.github/workflows/callable-fabbot.yml

@@ -9,7 +9,7 @@ permissions:
 jobs:
   call-fabbot:
     name: Fabbot
-    uses: ./.github/workflows/callable-fabbot.yml
+    uses: symfony-tools/fabbot/.github/workflows/fabbot.yml@main
     with:
       package: Symfony
       check_license: true