Extend expiry date of experimental multi-host flag

As the 'experimental-redfish-multi-computer-system' flag is actively
used for development the expiry has been extended.

Tested: Inspection only

Change-Id: I1bbf635a04b87ec59ec2eaabb01173258187092e
Signed-off-by: Oliver Brewka <oliver.brewka@9elements.com>
diff --git a/meson.options b/meson.options
index cb68db7..14cf611 100644
--- a/meson.options
+++ b/meson.options
@@ -431,7 +431,7 @@
     value: 'disabled',
     description: '''This is a temporary option flag for staging the
     ComputerSystemCollection transition to multi-host.  It, as well as the code
-    still beneath it will be removed on 6/1/2025.  Do not enable in a
+    still beneath it will be removed on 1/1/2026.  Do not enable in a
     production environment, or where API stability is required.''',
 )