Update DEVSTACK_SERIES to 2023.2

stable/2023.1 branch has been created now and
current master is for 2023.2.

Change-Id: Ibd499ac35a38a5c1818c1df6009c5273ef3e90f7
diff --git a/stackrc b/stackrc
index 442e9a0..b7ce238 100644
--- a/stackrc
+++ b/stackrc
@@ -248,7 +248,7 @@
 # Setting the variable to 'ALL' will activate the download for all
 # libraries.
 
-DEVSTACK_SERIES="2023.1"
+DEVSTACK_SERIES="2023.2"
 
 ##############
 #