Fix Laura's username on profile page

Why is this change being made?

I was loading up https://gitlab-org.gitlab.io/gitlab-roulette/ and noticed an error at the bottom of the page:

Errors:
[
  {
    "type": "error",
    "message": "No exact match found for: lauraMon",
    "stack": "Error: No exact match found for: lauraMon\n    at mapPerson (/builds/gitlab-org/gitlab-roulette/mr_analysis/02_parse_mrs_to_stats.js:231:11)\n    at runMicrotasks (<anonymous>)\n    at processTicksAndRejections (internal/process/task_queues.js:97:5)\n    at async mapPersonRetry (/builds/gitlab-org/gitlab-roulette/mr_analysis/02_parse_mrs_to_stats.js:311:12)\n    at async mapPersonRetry (/builds/gitlab-org/gitlab-roulette/mr_analysis/02_parse_mrs_to_stats.js:314:14)\n    at async mapPersonRetry (/builds/gitlab-org/gitlab-roulette/mr_analysis/02_parse_mrs_to_stats.js:314:14)\n    at async mapPersonRetry (/builds/gitlab-org/gitlab-roulette/mr_analysis/02_parse_mrs_to_stats.js:314:14)\n    at async /builds/gitlab-org/gitlab-roulette/mr_analysis/02_parse_mrs_to_stats.js:342:20\n    at async /builds/gitlab-org/gitlab-roulette/mr_analysis/lib/concurrency.js:13:5\n    at async Promise.all (index 2)"
  }
]

Looks like Laura changed usernames from @lauraMon to @lauraX.

Author Checklist

• Provided a concise title for the MR
• Added a description to this MR explaining the reasons for the proposed change, per say-why-not-just-what
• Assign this change to the correct DRI
  • If the DRI for the page/s being updated isn’t immediately clear, then assign it to one of the people listed in the "Maintained by" section in on the page being edited.
  • If your manager does not have merge rights, please ask someone to merge it AFTER it has been approved by your manager in #mr-buddies.
  • If the changes relate to any part of the project other than updates to content and/or data files please make sure to ping @gl-static-site-editor in a comment for a review and merge. For example changes to .gitlab-ci.yml, JavaScript/CSS/Ruby code or the layout files. (this requirement has been removed pending identification of a new DRI for the handbook)