add sig from northalpha for 1.1.0 stable release

1.1.0/sysupgrade/stable.manifest

@@ -354,3 +354,4 @@ x86-64 1.1.0 71a54000bf240473cfdc29124ca2c2454e77b895a42baa0f380cf6376a1ef7ef gl
 x86-64 1.1.0 27a7faec12bfc0aa84a7560d215f3ecdca3fd0e3dabf5004c2712e1144ff8fdfd807c91c21d0945ac091fdf24bbd89ead944b45f911ef4d3ad8ca96905108410 gluon-ffho-1.1.0-x86-64-sysupgrade.img.gz
 ---
 914608f1f43744a446ef06cbdb3866d36338e0abc8574e5668b93610fcf6560fa02d338721b57e376c15a2301ad2fce425075168d9044c36bb6d3a7f9b533308
+79a7efa6d4fcac67a6ca51924fab26d107c413fd5a4cb8a61b5d453be13ae90a91bfefbffcce5fd4cadd5356e92af35cff19c921ea4b41a750cdd705d7b4c30d