slack-desktop: update to 3.4.0.

Closes #11873.

Signed-off-by: Enno Boland <gottox@voidlinux.org>

srcpkgs/slack-desktop/template

@@ -1,6 +1,6 @@
 # Template file for 'slack-desktop'
 pkgname=slack-desktop
-version=3.3.8
+version=3.4.0
 revision=1
 archs="x86_64"
 short_desc="Messaging app for teams"
@@ -8,7 +8,7 @@ maintainer="Diogo Leal <diogo@diogoleal.com>"
 license="Proprietary"
 homepage="https://slack.com/"
 distfiles="https://slack-ssb-updates.global.ssl.fastly.net/linux_releases/${pkgname}-${version}-amd64.deb"
-checksum=37042b2172edf1af02cbe48660800c355e0b16f8f8f5d1257525657ff72f8308
+checksum=857b38862aa732a27c1cee5fcfdce490d624f22a5d8b4fd389d7ad06de1ba551
 restricted=yes
 repository="nonfree"
 nopie=yes