docs(migrate9): add missing changes for 9.0.0

Author: hasezoey

docs/guides/migration/migrate9.md

@@ -6,11 +6,15 @@ title: 'Migrate to version 9.0.0'
 Here are the Important changes made for 9.0.0
 
 :::caution Important, Read this first
-This Guide is written for migration from version `8.13.0` to `9.0.0`, for versions `>9.0.0 <10.0.0`, please consult the [CHANGELOG](https://github.com/nodkz/mongodb-memory-server/blob/master/CHANGELOG.md)
+This Guide is written for migration from version `8.15.0` to `9.0.0`, for versions `>9.0.0 <10.0.0`, please consult the [CHANGELOG](https://github.com/nodkz/mongodb-memory-server/blob/master/CHANGELOG.md)
 :::
 
 ## Breaking Changes
 
+### Minimal NodeJS version is now `14`
+
+With 9.0.0 the minimal nodejs required is `14.20.1`.
+
 ### Mongodb Driver Version upgraded to 5.x
 
 The used MongoDB Driver version is now `5.6.0`.
@@ -68,6 +72,19 @@ Some error classes have been merged:
 
 Storage Engines `devnull` and `mmapv1` have been removed because they are not supported in newer versions of mongodb anymore, `wiredTiger` should be used instead.
 
+### Linux fallback binary has been removed
+
+Previously there was a code-path for a fallback linux binary, but this has been removed because mongodb has stopped shipping generic linux binaries since versions after 4.0.
+
+If a fallback is still required, try to use the ubuntu binary via [Config Options `DISTRO`](../../api/config-options.md#distro).
+
+### Ubuntu fallback year has been updated
+
+The ubuntu fallback year has been updated to `22`, instead of the previous `14`, because newer versions of mongodb dont ship for any EOL ubuntu version anymore.
+
+This fallback is only used if the ubuntu year could not be parsed from the os-file.  
+This can also be overwritten with [Config Option `DISTRO`](../../api/config-options.md#distro).
+
 ## Non-Breaking changes / Additions
 
 ### Compiler target is now `es2019`
@@ -79,8 +96,16 @@ This should be a non-breaking change
 
 Crypto functions like for the md5 check and uuidv4 generation have been moved to use the `node:crypto` support, resulting in dropping 2 dependencies.
 
+Dropped dependencies are `md5-file` and `uuid`.
+
 ## Binary childprocess is now also `.unref()`
 
 The Mongodb Binary childprocess is now also `.unref()`, like the killer process has been for some time.
 
 This *should* help with non-closed instances not exiting the nodejs process.
+
+## The port testing has been replaced
+
+Previously MMS used `get-port`, but it caused some big memory-leakage across big projects, so it has been replaced with one that uses less maps.
+
+It also has been replaced because newer versions were ESM only, but we couldnt switch to ESM yet (and using ESM in CommonJS is not a great experience)