bump bootmgr SVN to 8

Author: olkorsha

PostSignedObjects/Optional/DBX/amd64/DBXUpdateSVN.bin

@@ -6904,12 +6904,12 @@
     ],
 	"svns": [
 		{
-            "value": "01612B139DD5598843AB1C185C3CB2EB92000007000000000000000000000000",
-            "version": "7.0",
+            "value": "01612B139DD5598843AB1C185C3CB2EB92000008000000000000000000000000",
+            "version": "8.0",
             "filename": "bootmgfw.efi",
             "guid": "{9d132b61-59d5-4388-ab1c-185c3cb2eb92} == EFI_BOOTMGR_DBXSVN_GUID",
             "description": "Windows Bootmgr SVN CVE-2023-24932",
-            "dateOfLastChange": "2025-06-06"
+            "dateOfLastChange": "2026-04-10"
         },
 		{
             "value": "019D2EF8E827E15841A4884C18ABE2F284000003000000000000000000000000",