Update release date & related bug fix in changelog

Author: andydotxyz

CHANGELOG.md

@@ -3,7 +3,7 @@
 This file lists the main changes with each version of the Fyne toolkit.
 More detailed release notes can be found on the [releases page](https://github.com/fyne-io/fyne/releases). 
 
-## 2.6.1 - 9 May 2025
+## 2.6.1 - 8 May 2025
 
 ### Changed
 
@@ -18,7 +18,7 @@ More detailed release notes can be found on the [releases page](https://github.c
  * RichTextSegment SizeName is not SizeNameText by default (#5307)
  * When there is an offline netdrive, the file dialog will freeze (#2411)
  * Correctly reset image cache when Resource goes to nil
-
+ * Data race after migration to v2.6.0 (#5713)
 
 ## 2.6.0 - 10 April 2025