fix(ci): install gcc for -race on fedora runner

.gitea/workflows/test.yml

@@ -39,6 +39,9 @@ jobs:
         with:
           go-version: "1.26"
 
+      - name: Install C compiler
+        run: sudo dnf install -y gcc
+
       - name: go test -race
         env:
           CGO_ENABLED: "1"