swupdate_git: fix wrong version

Version was set to 2026.06, it is 2026.05.

Signed-off-by: Stefano Babic <stefano.babic@swupdate.org>

recipes-support/swupdate/swupdate_git.bb

@@ -3,4 +3,4 @@ require swupdate.inc
 DEFAULT_PREFERENCE = "-1"
 
 SRCREV ?= "602edf8e57f940791034096c9e24206097b4b7a6"
-PV = "2026.06+git${SRCPV}"
+PV = "2026.05+git${SRCPV}"