Extend expiry date of experimental multi-host flag

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

Tested: Inspection only

Change-Id: I80289288b27895ea67b6084c774f88e6504ba38a
Signed-off-by: Oliver Brewka <mox669.dev@gmail.com>
diff --git a/meson.options b/meson.options
index 551f4f2..3d988b6 100644
--- a/meson.options
+++ b/meson.options
@@ -447,7 +447,7 @@
     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 3/1/2025.  Do not enable in a
+    still beneath it will be removed on 6/1/2025.  Do not enable in a
     production environment, or where API stability is required.''',
 )