release: add new mapping info (#15)

Signed-off-by: Patrick Stephens <pat@fluent.do>

Author: patrick-stephens

docs/version-mapping.md

@@ -6,4 +6,5 @@ The following shows the underlying [OSS version of Fluent Bit](https://github.co
 
 |FluentDo Agent Version|OSS Version Base|
 |----------------------|----------------|
+| 25.7.2 | 4.0.4 |
 | 25.7.1 | 4.0.3 |