fix(build): generated entry (#12477)

Author: ematipico

.changeset/thin-cups-peel.md

@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Fixes an issue where the SSR build was emitting the `dist/server/entry.mjs` file with an incorrect import at the top of the file/

packages/astro/src/core/build/plugins/plugin-ssr.ts

@@ -283,7 +283,6 @@ function generateSSRCode(settings: AstroSettings, adapter: AstroAdapter, middlew
 		`import { renderers } from '${RENDERERS_MODULE_ID}';`,
 		`import * as serverEntrypointModule from '${ADAPTER_VIRTUAL_MODULE_ID}';`,
 		`import { manifest as defaultManifest } from '${SSR_MANIFEST_VIRTUAL_MODULE_ID}';`,
-		edgeMiddleware ? `` : `import { onRequest as middleware } from '${middlewareId}';`,
 		settings.config.experimental.serverIslands
 			? `import { serverIslandMap } from '${VIRTUAL_ISLAND_MAP_ID}';`
 			: '',