fix: autosave potentially losing latest: true w/ race condition (#8894)

Fixes a potential race condition where versions could lose `latest:
true` and potentially also introduce a conflict with the `parent` field.

We now explicitly define these as we update versions in the
`saveVersion` function.

Author: jmikrut

packages/payload/src/versions/saveVersion.ts

@@ -82,6 +82,8 @@ export const saveVersion = async ({
 
         const data: Record<string, unknown> = {
           createdAt: new Date(latestVersion.createdAt).toISOString(),
+          latest: true,
+          parent: id,
           updatedAt: now,
           version: {
             ...versionData,