qemu: capabilities: Update qemu-5.0.0 capabilities for x86_64

Update to v4.2.0-2265-g67923a7ea6 to pick up recent addition of
'allow-write-only-overlay' feature of 'blockdev-snapshot' command.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml

@@ -228,7 +228,7 @@
   <version>4002050</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100241</microcodeVersion>
-  <package>v4.2.0-1858-gdb736e0437</package>
+  <package>v4.2.0-2365-gd4f7d56759</package>
   <arch>x86_64</arch>
   <hostCPU type='kvm' model='base' migratability='yes'>
     <property name='vmx-entry-load-rtit-ctl' type='boolean' value='false'/>