kafkacat: bump revision for librdkafka update

The checksum has changed, meaning this is a different build of 1.6.0 than
the previous revision.

srcpkgs/kafkacat/template

@@ -1,7 +1,8 @@
 # Template file for 'kafkacat'
 pkgname=kafkacat
 version=1.6.0
-revision=1
+revision=2
+wrksrc="kcat-${version}"
 build_style=configure
 configure_args="--prefix=/usr"
 makedepends="librdkafka-devel"
@@ -10,7 +11,7 @@ maintainer="Frank Steinborn <steinex@nognu.de>"
 license="BSD-2-Clause"
 homepage="https://github.com/edenhill/kafkacat"
 distfiles="${homepage}/archive/${version}.tar.gz"
-checksum=e67aecd153659d7ea0d561469a1e65038485fe9a3203fa8c9c59a9fe02164bf0
+checksum=300fd861d2d6b406ae8a9f5538055449e10da611076959993b8e2430101c4ea1
 
 post_install() {
 	vlicense LICENSE