Require fewer db privileges to run public_data:commit

In newer versions of MySQL, `mysqldump`'s default behavior requires
accessing some privileged `INFORMATION_SCHEMA` tables, which requires
the global `PROCESS` permission.

Rather than require that, we can just skip this step, by adding the
`--no-tablespaces` argument. This was the guidance I found when looking
up this issue! https://dba.stackexchange.com/a/274460/289961

lib/tasks/public_data.rake

@@ -30,6 +30,9 @@ namespace :public_data do
 		# Don't lock the database to do it!
 		args << "--single-transaction"
 
+		# Skip dumping tablespaces, so this requires fewer privileges.
+		args << "--no-tablespaces"
+
 		# Dump the public data tables from the primary database.
 		args << config.fetch(:database)
 		args += %w(species colors zones) # manual constants