Update haproxy

Changes:

- https://github.com/docker-library/haproxy/commit/e2db0c2: Merge pull request https://github.com/docker-library/haproxy/pull/154 from TimWolla/2.4-slz

library/haproxy

@@ -6,12 +6,12 @@ GitRepo: https://github.com/docker-library/haproxy.git
 
 Tags: 2.4-dev18, 2.4-dev
 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, mips64le, ppc64le, s390x
-GitCommit: f4a6a117947695082117106a5dcc13007e384951
+GitCommit: 7994bf8e4a0d6e28e1997a23c4c3aaefee9eb298
 Directory: 2.4-rc
 
 Tags: 2.4-dev18-alpine, 2.4-dev-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: f4a6a117947695082117106a5dcc13007e384951
+GitCommit: 7994bf8e4a0d6e28e1997a23c4c3aaefee9eb298
 Directory: 2.4-rc/alpine
 
 Tags: 2.3.10, 2.3, latest