bug#3804: 23.0.95; customize-changed-options-previous-release needs to be bumped

I bet M-x customize-changed will show too many changes by default:

,----
| customize-changed-options-previous-release is a variable defined in `cus-edit.el'.
| Its value is "21.1"
| 
| Documentation:
| Version for `customize-changed-options' to refer back to by default.
`----

The value should be increased to "22.1" at least.