Fix code scanning alert - storage of SE API secret

[Oaphi]

Tracking issue for:

• [x] https://github.com/codidact/qpixel/security/code-scanning/46

Minor thing but yeah, we should probably not store the secret in plain text (although it's a bit way too much work for little benefit. Still, somebody might want to tackle it).

[ArtOfCode-]

False positive - this doesn't result in the secret being exposed anywhere.