Avoid bumping min-airflow-version in prepare-provider-documentation (#36191)

The change #36160 included removed providers in documentation
generation - which is unnecesary and we should not do it.

This PR avoids doing it for removed providers.

(cherry picked from commit c2f440d)

Author: potiuk

dev/breeze/src/airflow_breeze/prepare_providers/provider_documentation.py

@@ -993,6 +993,8 @@ def update_min_airflow_version(
     :return:
     """
     provider_details = get_provider_details(provider_package_id)
+    if provider_details.removed:
+        return
     jinja_context = get_provider_documentation_jinja_context(
         provider_id=provider_package_id,
         with_breaking_changes=with_breaking_changes,