Deb: Ignore Lintian error on ColumnStore libjemalloc.so inclusion

Related: MDEV-24124

Partial upstreaming of Debian packaging commit
https://salsa.debian.org/mariadb-team/mariadb-10.5/-/commit/93a02bbe848ef9810d44635a3b4d409e71bd0628

debian/source/lintian-overrides

@@ -20,3 +20,5 @@ version-substvar-for-external-package mariadb-client-10.5 -> mysql-client-core-5
 version-substvar-for-external-package mariadb-client-10.5 -> mysql-client-core-8.0
 version-substvar-for-external-package mariadb-client-10.5 -> mysql-client-core-8.0
 version-substvar-for-external-package libmariadbd-dev -> libmariadbclient-dev
+# ColumnStore not used in Debian, safe to ignore. Reported upstream in https://jira.mariadb.org/browse/MDEV-24124
+source-is-missing storage/columnstore/columnstore/utils/jemalloc/libjemalloc.so.2