Downgrade firecracker action to v0.3 (#13786)

See acj/freebsd-firecracker-action#3

Author: konstin

.github/workflows/ci.yml

@@ -712,7 +712,7 @@ jobs:
           cross build --target x86_64-unknown-freebsd
 
       - name: Test in Firecracker VM
-        uses: acj/freebsd-firecracker-action@49738581fe238ad84ae7dd26f69f3960252f6994 # v0.4.0
+        uses: acj/freebsd-firecracker-action@4d93174d9eea32cd2b2650f964af69f8c72eaff2 # v0.3.0 - see https://github.com/acj/freebsd-firecracker-action/issues/3#issuecomment-2931399473
         with:
           verbose: false
           checkout: false