Update change log for effection v4 upgrade

Updated to include changes related to the upgrade to `effection` v4 and the addition of `@effectionx/process` for improved functionality.

Author: jbolda

.changes/change-pr-345.md

@@ -2,4 +2,4 @@
 "@simulacrum/server": minor
 ---
 
-Bump server to `effection` v4. With the tight dependency fitting into an `effection` runtime, bumping with a minor despite no specific breaking changes directly in this package.
+Bump server to `effection` v4. With the tight dependency fitting into an `effection` runtime, bumping with a minor despite no specific breaking changes directly in this package. Additionally, we swapped to `@effectionx/process` and pulled in some other helpers. This was to prevent edge cases which were noted as part of the upgrade.