Update @swc/core npm package to v1.6.6 (#67379)

### What?

Update `@swc/core` to the latest.

### Why?

To keep in sync.

Author: kdy1

package.json

@@ -92,7 +92,7 @@
     "@replayio/replay": "0.20.1",
     "@svgr/webpack": "5.5.0",
     "@swc/cli": "0.1.55",
-    "@swc/core": "1.5.7",
+    "@swc/core": "1.6.6",
     "@swc/helpers": "0.5.11",
     "@swc/types": "0.1.7",
     "@testing-library/jest-dom": "6.1.2",

packages/next/package.json

@@ -163,7 +163,7 @@
     "@next/swc": "15.0.0-canary.52",
     "@opentelemetry/api": "1.6.0",
     "@playwright/test": "1.41.2",
-    "@swc/core": "1.5.7",
+    "@swc/core": "1.6.6",
     "@swc/types": "0.1.7",
     "@taskr/clear": "1.1.0",
     "@taskr/esnext": "1.1.0",