Post-branching version bump

NEWS

@@ -1,3 +1,9 @@
+Changes in 1.17.3
+~~~~~~~~~~~~~~~~~~
+Released: not yet
+
+...
+
 Changes in 1.17.2
 ~~~~~~~~~~~~~~~~~~
 Released: 2025-12-15

meson.build

@@ -4,7 +4,7 @@
 project(
   'flatpak',
   'c',
-  version : '1.17.2',
+  version : '1.17.3',
   default_options: [
     'warning_level=2',
   ],
@@ -13,7 +13,7 @@ project(
 
 flatpak_major_version = 1
 flatpak_minor_version = 17
-flatpak_micro_version = 2
+flatpak_micro_version = 3
 flatpak_extra_version = ''
 
 flatpak_interface_age = 0