[Admin] Add @BionIT as a maintainer (opensearch-project#5988) (opense…

…arch-project#6160)

* add BionIT as a maintainer

Signed-off-by: Flyingliuhub <33105471+flyingliuhub@users.noreply.github.com>

* update pr link in the changelog.md

Signed-off-by: Flyingliuhub <33105471+flyingliuhub@users.noreply.github.com>

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Signed-off-by: Flyingliuhub <33105471+flyingliuhub@users.noreply.github.com>
(cherry picked from commit c2ac4c8)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

# Conflicts:
#	CHANGELOG.md

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>