Bump actions/checkout and fsfe/reuse-action to v6

Author: flashcode

.github/workflows/reuse.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps:
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: REUSE Compliance Check
-        uses: fsfe/reuse-action@v4
+        uses: fsfe/reuse-action@v6