install_update: Update grub2 on UEFI due to new signature

shim update will fail with old grub2 because of old signature

UEFI signatures.

grub2-x86_64-efi-2.02-123.4.1 2021 UEFI Key (10y)
grub2-x86_64-efi-2.02-26.43.1 2021 UEFI Key (5y)
grub2-x86_64-efi-2.02-26.40.1 2020 UEFI Key

Every 2021 signature will work with the new shim.
Older signatures will fail.

tests/qam-minimal/install_update.pm

@@ -33,6 +33,11 @@ sub run {
     my ($self) = @_;
     select_console 'root-console';
 
+    # shim update will fail with old grub2 due to old signature
+    if (check_var('MACHINE', 'uefi')) {
+        zypper_call('up grub2 grub2-x86_64-efi kernel-default');
+    }
+
     capture_state('before');
 
     # Set and check patch variables