.forgejo: Update DCO action

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

.forgejo/workflows/dco.yml

@@ -1,3 +1,4 @@
+name: DCO action
 on: [pull_request]
 
 jobs:
@@ -12,9 +13,9 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v3
         with:
-          go-version: '1.20'
+          go-version: '1.21'
 
       - name: Run commit format checker
-        uses: https://git.alexvan.in/alexvanin/dco-go@v1
+        uses: https://git.frostfs.info/TrueCloudLab/dco-go@v2
         with:
-          from: dca6ff62
+          from: 'origin/${{ github.event.pull_request.base.ref }}'