How to get F-Droid to detect updates of itself - how to remove "ignored updates"?
The F-Droid App controls its own updating through an option within the app. When you start F-Droid, visit the internal settings in the "hamburger" menu ( the three dots). It can have its own updates restricted if the setting "Ignore All Updates" is checked. Uncheck this setting to allow F-Droid to maintain itself.