fix(deps): update dependency @astrojs/vercel to v8 (#648)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -20,7 +20,7 @@
 	"author": "Dev Protocol",
 	"license": "MPL-2.0",
 	"dependencies": {
-		"@astrojs/vercel": "^7.0.0",
+		"@astrojs/vercel": "^8.0.0",
 		"@devprotocol/dev-kit": "8.7.0",
 		"@devprotocol/util-ts": "4.0.0",
 		"astro": "^4.0.0",