.github: fix length of dependabot commit message prefix

Followup to commit 265f727481c729fbe78dce7410def7de6fe869d1.

Fixes this error mesage under GitHub Insights (https://github.com/ceph/ceph/network/updates):

```
The property '#/updates/1/commit-message/prefix' was not of a maximum string length of 15
```

Signed-off-by: Laura Flores <lflores@ibm.com>

diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 98b7d53d81197a3b6d694f3a43be3549d72ca796..d2313459703034f5f5893ee52811033d6ca90b9e 100644 (file)
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -17,6 +17,6 @@ updates:
     schedule:
       interval: "daily"
     commit-message:
-      prefix: ".github/workflows:"
+      prefix: ".github:"
     pull-request-branch-name:
       separator: "-"