CI: Upgrade freebsd-firecracker-action to 0.10.3 to pick up stability fixes

Author: acj

.github/workflows/ci.yml

@@ -124,7 +124,7 @@ jobs:
         run: cross test --release --no-run --target x86_64-unknown-freebsd
 
       - name: Launch Firecracker VM
-        uses: acj/freebsd-firecracker-action@v0.10.1
+        uses: acj/freebsd-firecracker-action@v0.10.3
         with:
           verbose: false
           pre-run: |