security/cyberchef: Update to 9.38.6

Official log for 9.38.0
https://github.com/gchq/CyberChef/blob/master/CHANGELOG.md

Fixes for 9.38.1 to 9.38.6
Tidied up 'PEM to Hex' operation
Added 'Strict mode' to 'From Base64' operation
Fixed toBinary delim adjustment
fix-to-base45
Fixed Split.js issues when resizing to around 1000px wide
Fixed 'To Hex' highlighting
Fixed CSS for maximising output pane

PR: 264436