Update haproxy
Update haproxy

Changes:

- https://github.com/docker-library/haproxy/commit/a974120: Update to 2.1.8
- https://github.com/docker-library/haproxy/commit/1a794ea: Update to 1.9.16
- https://github.com/docker-library/haproxy/commit/ee573f8: Update to 2.3-dev2
- https://github.com/docker-library/haproxy/commit/c8d4c15: Update to 2.0.17
- https://github.com/docker-library/haproxy/commit/f542ba2: Revert ebtree patch in template so docker-library-bot can do version bumps

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