Bump the version of miniflare to 3.20230801.0 (#3693)

* Bump the version of miniflare to 3.20230801.0

* ci: do not run tests in parallel to avoid CI flakes

It seems that on Linux running tests in parallel can result in workerd
segmentation faults. Possibly due to port conflicts??

This change will run all the tests serially, which slows down the jobs
but makes them more reliable.

---------

Co-authored-by: Peter Bacon Darwin <[email protected]>

Author: RamIdeas

.changeset/orange-donkeys-report.md

@@ -0,0 +1,5 @@
+---
+"wrangler": patch
+---
+
+Bump the version of miniflare to 3.20230801.0

fixtures/pages-ws-app/package.json

@@ -16,7 +16,7 @@
 	},
 	"devDependencies": {
 		"@cloudflare/workers-tsconfig": "*",
-		"miniflare": "3.20230724.0",
+		"miniflare": "3.20230801.0",
 		"wrangler": "*",
 		"ws": "^8.8.0"
 	},