chore: Update Docker image tags in build workflow

- Changed Docker image tags in the build workflow to reflect the new repository owner.
- Updated the image references to use 'carrotskin' instead of the previous owner for consistency.

.gitea/workflows/build.yml

@@ -70,6 +70,6 @@ jobs:
           build-args: |
             BINARY_NAME=mcauth-linux-amd64
           tags: |
-            code.littlelan.cn/${{ github.repository_owner }}/mcauth:latest
+            code.littlelan.cn/carrotskin/mcauth:latest
-            code.littlelan.cn/${{ github.repository_owner }}/mcauth:${{ github.sha }}
+            code.littlelan.cn/carrotskin/mcauth:${{ github.sha }}
           platforms: linux/amd64