main/osk-sdl: upgrade to 0.56 (MR 1379)

main/osk-sdl/APKBUILD

 # Maintainer: Clayton Craft <clayton@craftyguy.net>
 pkgname=osk-sdl
-pkgver=0.55
+pkgver=0.56
 pkgrel=0
 pkgdesc="Onscreen keyboard for unlocking LUKS devices"
 url="https://gitlab.com/postmarketOS/osk-sdl"
@@ -21,4 +21,4 @@ package() {
 	install -D -m755 osk.conf \
 		"$pkgdir"/etc/osk.conf
 }
-sha512sums="378a258e3f00a4454074d15757f28805a40b068ea9532abc74d4ba3c28ea66a195b52f1429f7733fad7fa8582796f80f7c2d1d3699155866d2d14a5daedf0ddc  osk-sdl-0.55.tar.gz"
+sha512sums="aa870757d8acdcaacb283e1b1f14cd2def5cd4a25f026ffce6cc06ce5a75bc6026d6a2c11b51876ea855ef87e0e094daba59094ad15e9cd3c8c7edad5277842f  osk-sdl-0.56.tar.gz"