release: prepare for 3.34.0

NEWS

-3.3.90
+3.34.0
+======
+
+- Add support for moving Nautilus selection with arrow keys (#5)
+- Add support for parenting the window on Wayland (#1)
+- Use builder-dark style for text/source viewer (#24)
+- Add localization for appdata file (!11, Piotr Drąg)
+
+3.33.90
 ======
 
 - Add a command line launcher (#758253)

meson.build

 project(
   'sushi',
   'c',
-  version: '3.33.90',
+  version: '3.34.0',
   meson_version: '>=0.46.0'
 )