flatpak: Use new flatpak API to automatically remove EOL runtimes
When constructing the update transaction, tell flatpak that it can clean up unused EOL runtimes during the transaction.
We don't have any UI for that, which hopefully should be fine.
When constructing the update transaction, tell flatpak that it can clean up unused EOL runtimes during the transaction.
We don't have any UI for that, which hopefully should be fine.