x11/kitty: Update to 0.26.4

ChangeLog: https://sw.kovidgoyal.net/kitty/changelog/#detailed-list-of-changes

• Allow centering the background_image
• X11: Fix a regression in the previous release that caused pasting from GTK based applications to have extra newlines
• Tab bar: Improve empty space management when some tabs have short titles, allocate the saved space to the active tab
• Fix background_tint not applying to window margins and padding
• Wayland: Fix background image scaling using tiled mode on high DPI screens
• Wayland: Fix an abort when changing background colors with wayland_titlebar_color set to background
• Update to Unicode 15.0
• GNOME Wayland: Fix a memory leak in gnome-shell when using client side decorations
• Wayland: Mark windows in which a bell occurs as urgent on compositors that support the xdg-activation protocol
• Allow passing null bytes through the system clipboard
• ssh kitten: Fix KITTY_PUBLIC_KEY not being encoded properly when transmitting
• Sessions: Allow controlling which OS Window is active via the focus_os_window directive
• Wayland: Fix for bug in NVIDIA drivers that prevents transparency working
• Wayland: Fix for a bug that could cause kitty to become non-responsive when using multiple OS windows in a single instance on some compositors
• Wayland: Fix for a bug preventing kitty from starting on Hyprland when using a non-unit scale
• Wayland: Generate a XDG_ACTIVATION_TOKEN when opening URLs or running programs in the background via the launch action
• Fix a regression that caused kitty not to restore SIGPIPE after python nukes it when launching children. Affects bash which does not sanitize its signal mask.
• Fix a use-after-free when handling fake mouse clicks and the action causes

windows to be removed/re-allocated

PR: 267209
Reported by: alexis.praga@proton.me (maintainer)
MFH: 2022Q4 (bugfixes)

(cherry picked from commit 0720e8460e93b225d3b95d268ecb097e850f981c)