New upstream release 26.6.0

Update the changelog.

Author: lhannigbrinck

debian/changelog

@@ -1,3 +1,9 @@
+python-gvm (26.6.0-gos2404~1) shredder; urgency=medium
+
+  * Change: New upstream release 26.6.0. (Closes: GOS-2432)
+
+ -- Lukas Hannigbrinck <[email protected]>  Tue, 09 Sep 2025 15:20:27 +0200
+
 python-gvm (26.5.0-gos2404~1) shredder; urgency=medium
 
   * Change: New upstream release 26.5.0. (Closes: GOS-2411)