"4 Ways developers can write secure code with GitLab" - Sep 3

Closes #5038 (closed)

Checklist for writer

• Link to issue added, and set to close when this MR is merged
• Due date and milestone (if applicable) added for the desired publish date
• If time sensitive
  • Added ~"priority" label
  • Mentioned @rebecca to give her a heads up ASAP
• Blog post file formatted correctly, including any accompanying images
• Review app checked for any formatting issues
• Reviewed by fellow team member
• Assign to @rebecca for review

/label ~"blog post"