ci: Fix sync-common workflow (#52)

GHA apparently doesn't follow symlinks for actions.

Signed-off-by: Colin Walters <walters@verbum.org>

Author: cgwalters

.github/workflows/sync-common.yml

@@ -29,7 +29,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Setup Rust
-        uses: ./.github/actions/setup-rust
+        uses: ./common/.github/actions/setup-rust
 
       - name: Build sync-common
         run: cargo build --release --manifest-path scripts/sync-common/Cargo.toml