fix(deps): update dependency @preact/signals to v2

examples/framework-preact/package.json

@@ -11,7 +11,7 @@
   },
   "dependencies": {
     "@astrojs/preact": "^4.0.1",
-    "@preact/signals": "^1.3.0",
+    "@preact/signals": "^2.0.0",
     "astro": "^5.1.1",
     "preact": "^10.24.3"
   }

packages/astro/test/fixtures/preact-component/package.json

@@ -4,7 +4,7 @@
   "private": true,
   "dependencies": {
     "@astrojs/preact": "workspace:*",
-    "@preact/signals": "1.3.0",
+    "@preact/signals": "2.0.0",
     "astro": "workspace:*",
     "preact": "^10.25.0"
   }

packages/integrations/preact/package.json

@@ -38,7 +38,7 @@
     "@babel/plugin-transform-react-jsx": "^7.25.9",
     "@babel/plugin-transform-react-jsx-development": "^7.25.9",
     "@preact/preset-vite": "2.8.2",
-    "@preact/signals": "^1.3.0",
+    "@preact/signals": "^2.0.0",
     "babel-plugin-transform-hook-names": "^1.0.2",
     "preact-render-to-string": "^6.5.11",
     "vite": "^6.0.5"