Update DEVSTACK_SERIES to 2025.2

stable/2025.1 branch has been created now and
current master is for 2025.2.

Change-Id: Iba81d280ebf1bd488bd590bdc4e31c49782c7099
diff --git a/stackrc b/stackrc
index c05d4e2..0319fc8 100644
--- a/stackrc
+++ b/stackrc
@@ -252,7 +252,7 @@
 # Setting the variable to 'ALL' will activate the download for all
 # libraries.
 
-DEVSTACK_SERIES="2025.1"
+DEVSTACK_SERIES="2025.2"
 
 ##############
 #