build(spec): bump TypeSpec packages to 1.13.0 stable

1.13.0 carries microsoft/typespec#10656 (uniqueItems on operation
parameter schemas) and #10677 (no auth scheme models under
components.schemas), so the dev prerelease pins are no longer needed.

Author: dschmidt

spec/package-lock.json

@@ -7,10 +7,10 @@
     "build": "tsp compile ."
   },
   "dependencies": {
-    "@typespec/compiler": "1.13.0-dev.5",
-    "@typespec/http": "1.13.0-dev.0",
-    "@typespec/json-schema": "1.13.0-dev.1",
-    "@typespec/openapi": "1.13.0-dev.0",
-    "@typespec/openapi3": "1.13.0-dev.2"
+    "@typespec/compiler": "1.13.0",
+    "@typespec/http": "1.13.0",
+    "@typespec/json-schema": "1.13.0",
+    "@typespec/openapi": "1.13.0",
+    "@typespec/openapi3": "1.13.0"
   }
 }