Integrities are concatenated

## Description

When run multiple times, the lock file changes every time, because the integrity strings are concatenated to the old integrity value.

## Suggested Solution

Replace the integrity value instead of adding to it.

## Help Needed

N/A

Start by locating the lock-file update path that writes integrity values, then reproduce the issue by running the tool multiple times and comparing the lock file. Done means each run replaces the integrity value rather than concatenating it, leaving the lock file unchanged after the first update.

Written by the indexing model from the issue text.