Update mantle container image to latest HEAD

Flatcar Buildbot · Flatcar Buildbot · commit 78980281c48e · 2023-11-06T15:55:58.000Z
diff --git a/sdk_container/.repo/manifests/mantle-container b/sdk_container/.repo/manifests/mantle-container
@@ -1 +1 @@
-ghcr.io/flatcar/mantle:git-99dccdb94e34d02566d4bf155a89763c7dd74e4f
+ghcr.io/flatcar/mantle:git-1276c732fb6e7fd0878429afe8dca7be2b2ef720

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-ghcr.io/flatcar/mantle:git-99dccdb94e34d02566d4bf155a89763c7dd74e4f`
	`1`	`+ghcr.io/flatcar/mantle:git-1276c732fb6e7fd0878429afe8dca7be2b2ef720`