[Security] fixed usage of the salt for the bcrypt encoder (refs #8210)

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #8210
| License       | MIT
| Doc PR        | n/a

see #8210