Update haproxy

Changes:

- docker-library/haproxy@4375313: Merge pull request docker-library/haproxy#128 from infosiftr/apply-canonical-backported-patch
- docker-library/haproxy@461dcbf: Apply the canonical backported ebtree patch from upstream

Author: docker-library-bot

library/haproxy

@@ -41,7 +41,7 @@ Directory: 2.0
 
 Tags: 2.0.16-alpine, 2.0-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: c4081598aacb56651940e84a04c8e03c403aec3c
+GitCommit: 461dcbfa8538c9ab47d41b96f3c8d1835166382e
 Directory: 2.0/alpine
 
 Tags: 1.9.15, 1.9, 1