chore: attach mongoMemoryServer to db and destroy in tests (#5326)

* chore: attach mongoMemoryServer to db and destroy in tests

* bump mongodb-memory-server to 9.x

---------

Co-authored-by: Paul Popus <paul@nouance.io>

test/plugin-seo/int.spec.ts

@@ -2,13 +2,13 @@ import path from 'path'
 import { fileURLToPath } from 'url'
 
 import type { Payload } from '../../packages/payload/src/index.js'
-
 import { getPayload } from '../../packages/payload/src/index.js'
 import getFileByPath from '../../packages/payload/src/uploads/getFileByPath.js'
 import removeFiles from '../helpers/removeFiles.js'
 import { startMemoryDB } from '../startMemoryDB.js'
 import configPromise from './config.js'
 import { mediaSlug } from './shared.js'
+
 const filename = fileURLToPath(import.meta.url)
 const dirname = path.dirname(filename)
 
@@ -48,6 +48,12 @@ describe('@payloadcms/plugin-seo', () => {
     })
   })
 
+  afterAll(async () => {
+    if (typeof payload.db.destroy === 'function') {
+      await payload.db.destroy()
+    }
+  })
+
   it('should add meta title', async () => {
     const pageWithTitle = await payload.update({
       collection: 'pages',