konquest: update to 21.12.2.

Also:
- add changelog

srcpkgs/konquest/template

@@ -1,6 +1,6 @@
 # Template file for 'konquest'
 pkgname=konquest
-version=21.08.3
+version=21.12.2
 revision=1
 build_style=cmake
 hostmakedepends="extra-cmake-modules qt5-qmake qt5-host-tools kcoreaddons kdoctools
@@ -11,5 +11,6 @@ short_desc="KDE galactic conquest game"
 maintainer="Olga Ustuzhanina <me@laserbat.pw>"
 license="GPL-2.0-or-later"
 homepage="https://kde.org/applications/en/games/org.kde.konquest"
+changelog="https://kde.org/announcements/changelogs/gear/${version}/#konquest"
 distfiles="${KDE_SITE}/release-service/${version}/src/konquest-${version}.tar.xz"
-checksum=3b4ab2ba43c2131cdead87b1de68a1c690935ed06e59f911f5bc587fc8ff5b6f
+checksum=85555e9ad2bec6b8d534706f604c3faac0ad8658c5f7f0b047bbb28b3ab93dab