Update min. Maven version to 3.9.14 in Java Migration Guide (#2627)

Consider changes in PR:
https://github.wdf.sap.corp/cds-java/cds-services/pull/6919

---------

Co-authored-by: Adrian Görler <adrian.goerler@sap.com>

Author: mofterdinger

java/migration.md

@@ -69,7 +69,7 @@ CAP Java 5.0 increased some minimum required versions:
 | --- | --- |
 | Spring Boot | 4.0 |
 | XSUAA (BTP Security Library) | 4.0.0 |
-| Maven | 3.9.15 |
+| Maven | 3.9.14 |
 
 <!-- ### Adjusted Property Defaults
 
@@ -119,7 +119,7 @@ There are some incompatibilities in the [`cds-maven-plugin`](./assets/cds-maven-
 
 #### Minimum Maven Version
 
-For security reasons, the minimum required Maven version has been increased to **3.9.10**. Make sure to update your Maven version accordingly in your build environment. We strongly recommend using the latest available Maven 3.9.x (not 4.0.x) version, which is currently **3.9.15** at the time of writing.
+For security reasons, the minimum required Maven version has been increased to **3.9.14**. Make sure to update your Maven version accordingly in your build environment. We strongly recommend using the latest available Maven 3.9.x (not 4.0.x) version, which is currently **3.9.16** at the time of writing.
 
 #### Removed deprecated goal `install-cdsdk`