ci: XEP validation: Update GitHub action for changed files

Update tj-actions/changed-files to v46

Author: cal0pteryx

.github/workflows/xep-validation.yml

@@ -16,7 +16,7 @@ jobs:
 
       - name: Detect changes to XEP files
         id: changed-xeps
-        uses: tj-actions/changed-files@v41
+        uses: tj-actions/changed-files@v46
         with:
           files: |
             xep-*.xml