Tweaked the password-compat version constraint

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | N/A
| License       | MIT
| Doc PR        | N/A

##### This pull request tweaks the `"ircmaxell/password-compat` version constraint in the 2.3 branch.

I've updated the version constraint to `"~1.0"` match the way we require all "stable" releases. Note that this version constraint is technically different, but I consider it safe still.