Update osbuild/images to v0.56.0

Signed-off-by: Tomáš Hozza <thozza@redhat.com>

vendor/github.com/osbuild/images/pkg/manifest/os.go

@@ -136,6 +136,10 @@ type OSCustomizations struct {
 	Files       []*fsnode.File
 
 	FIPS bool
+
+	// NoBLS configures the image bootloader with traditional menu entries
+	// instead of BLS. Required for legacy systems like RHEL 7.
+	NoBLS bool
 }
 
 // OS represents the filesystem tree of the target image. This roughly
@@ -171,9 +175,6 @@ type OS struct {
 	platform  platform.Platform
 	kernelVer string
 
-	// NoBLS configures the image bootloader with traditional menu entries
-	// instead of BLS. Required for legacy systems like RHEL 7.
-	NoBLS     bool
 	OSProduct string
 	OSVersion string
 	OSNick    string