Post-release version bump to 1.0.3
Post-release version bump to 1.0.3

Distrotech/json-glib,GNOME/json-glib,ebassi/json-glib,Distrotech/json-glib,frida/json-glib,GNOME/json-glib,ebassi/json-glib,frida/json-glib,Distrotech/json-glib,ebassi/json-glib