Fixing the HealthCheck cmd

Author: s7clarke10

tox.ini

@@ -10,7 +10,7 @@ ports =
 environment =
     ACCEPT_EULA=y
     MSSQL_SA_PASSWORD=testDatabase1
-healthcheck_cmd = /opt/mssql-tools/bin/sqlcmd \
+healthcheck_cmd = /opt/mssql-tools18/bin/sqlcmd \
     -U SA -P $MSSQL_SA_PASSWORD \
     -q "select 1"
 healthcheck_timeout = 1