Revert "Pin OpenSearch Dashboards to 2.15"

This reverts commit a58a7f8.

Reason for revert: bug fixed upstream opensearch-project/OpenSearch-Dashboards#8097

Change-Id: Ib22a7ffaecc97408dcffe351232abbfdf7122c7c

docker/opensearch/opensearch-dashboards/Dockerfile.j2

@@ -10,20 +10,7 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
 {{ macros.configure_user(name='opensearch-dashboards', shell='/bin/bash', homedir='/usr/share/opensearch-dashboards') }}
 {{ macros.enable_extra_repos(['opensearch-dashboards']) }}
 
-# NOTE(mgoddard): Pinning to 2.15 due to https://bugs.launchpad.net/kolla/+bug/2077319
-{% if base_package_type == 'deb' %}
-COPY apt_preferences_opensearch_dashboards /etc/apt/preferences.d/opensearch_dashboards
-{% endif %}
-
-{% if base_package_type == 'rpm' %}
-    {% set opensearch_dashboards_packages = [
-        'opensearch-dashboards-2.15.*'
-    ] %}
-{% elif base_package_type == 'deb' %}
-    {% set opensearch_dashboards_packages = [
-        'opensearch-dashboards'
-    ] %}
-{% endif %}
+{% set opensearch_dashboards_packages = ['opensearch-dashboards'] %}
 
 {{ macros.install_packages(opensearch_dashboards_packages | customizable("packages")) }}