Update haproxy
Update haproxy

Changes:

- https://github.com/docker-library/haproxy/commit/eef6393: Update 2.6-rc to 2.6-dev10
- https://github.com/docker-library/haproxy/commit/2a634b8: Update 2.5 to 2.5.7
- https://github.com/docker-library/haproxy/commit/c1ad6f1: Update 2.4 to 2.4.17
- https://github.com/docker-library/haproxy/commit/56be0cf: Update 2.2 to 2.2.24
- https://github.com/docker-library/haproxy/commit/dbe220e: Update 2.0 to 2.0.29

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