ci: Fixed fetch-depth option for syncing labels

Now the workflow for the `Sync Labels` is corectly configured.

For faster performance, we configured the fetch-depth option and
set the depth to 1. This allows for faster pulling of the repository,
resulting in improved performance.

.github/labels.yml

@@ -4,7 +4,7 @@
 # This file is used to declaratively define the GitHub repository default labels.
 # Documentation: https://github.com/Financial-Times/github-label-sync/#label-config-file
 
-# Generic
+# Generic labels
 - name: bug
   color: B60205
   description: Something isn't working

.github/workflows/labels.yml

@@ -27,7 +27,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
         with:
-          fetch-depth: 0
+          fetch-depth: 1
       - name: Syncing labels
         uses: crazy-max/ghaction-github-labeler@v5
         with: