libspelling: upgrade 0.4.5 -> 0.4.6

Changelog:
==========
 * Improve detection of asynchronous fragment cancellation to break out
   of long-running spellchecking.
 * Fix Rust example and documentation links.

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-gnome/recipes-gnome/libspelling/libspelling_0.4.5.bb → meta-gnome/recipes-gnome/libspelling/libspelling_0.4.6.bb

@@ -16,4 +16,4 @@ GIDOCGEN_MESON_OPTION = 'docs'
 PACKAGECONFIG ?= ""
 PACKAGECONFIG[sysprof] = "-Dsysprof=true,-Dsysprof=false,sysprof"
 
-SRC_URI[archive.sha256sum] = "ec0372d83f42b65aee3734248ef8e2ffbfba4ea91268419c98ea44a00ef3e83f"
+SRC_URI[archive.sha256sum] = "3248a9b5336ea2f727d2db912d2f0083accc0505ce707679b3d9b8266c0101f5"