Update devel/okteta to latest upstream commit

Okteta is a viewer and editor for raw file data (aka "hex editor").
It provides "hex editor" libraries for other applications as well.

Changes since 0.26.4:

• Improved: Structure definitions allow custom pointer interpretations in JS
• Improved: cursor flash time setting of 0 (= no blinking) supported
• Improved: cursor shows char/value in background color instead of blank
• Improved: new menu entry for selecting custom UI color scheme
• Improved: less deprecated Qt/KF code usage
• Improved: translations

Reported by: portscout