Update haproxy
Update haproxy

Changes:

- https://github.com/docker-library/haproxy/commit/8d69936: Update to 2.2.1
- https://github.com/docker-library/haproxy/commit/4375313: Merge pull request https://github.com/docker-library/haproxy/pull/128 from infosiftr/apply-canonical-backported-patch
- https://github.com/docker-library/haproxy/commit/461dcbf: Apply the canonical backported ebtree patch from upstream

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