Prepare v1.15.8

Signed-off-by: Simon McVittie <[email protected]>

meson.build

@@ -4,7 +4,7 @@
 project(
  'flatpak',
  'c',
- version : '1.15.7',
+ version : '1.15.8',
  default_options: [
  'warning_level=2',
  ],
@@ -13,7 +13,7 @@ project(
 
 flatpak_major_version = 1
 flatpak_minor_version = 15
-flatpak_micro_version = 7
+flatpak_micro_version = 8
 flatpak_extra_version = ''
 
 flatpak_interface_age = 0