Bump OS v1.8-20260605 (#1293)

Signed-off-by: wheatdog <wheatdog@users.noreply.github.com>
Co-authored-by: wheatdog <wheatdog@users.noreply.github.com>

Author: harvesterhci-io-github-bot

scripts/package-harvester-os

@@ -31,7 +31,7 @@ source ${SCRIPTS_DIR}/version-rancher
 source ${SCRIPTS_DIR}/version-harvester ${TOP_DIR}/../harvester
 source ${SCRIPTS_DIR}/lib/iso
 
-BASE_OS_IMAGE="rancher/harvester-os:v1.8-20260424"
+BASE_OS_IMAGE="rancher/harvester-os:v1.8-20260605"
 HARVESTER_OS_IMAGE=rancher/harvester-os:$VERSION
 
 cd ${PACKAGE_HARVESTER_OS_DIR}