wip: change workflows checkout action to self hosted version

.gitea/workflows/ci.yaml

@@ -11,10 +11,10 @@ jobs:
   build:all:
     runs-on: native
     steps:
-      - uses: https://gitea.com/ScMi1/checkout@v1.4
+      - uses: actions/checkout@v6-gitea
       - run: nix build -L --no-link --print-out-paths .#bsc.ci.all
   build:cross:
     runs-on: native
     steps:
-      - uses: https://gitea.com/ScMi1/checkout@v1.4
+      - uses: actions/checkout@v6-gitea
       - run: nix build -L --no-link --print-out-paths .#bsc.ci.cross