fix: add network permission

Adds the network permission, as one of the new features requires
connecting to a server.

build-aux/io.github.finefindus.Hieroglyphic.json

@@ -8,6 +8,7 @@
     ],
     "command": "hieroglyphic",
     "finish-args": [
+        "--share=network",
         "--socket=wayland",
         "--socket=fallback-x11",
         "--share=ipc",