Use shorter version in connection attributes

[bgrainger]

Client connection attributes were added in #293. MySqlConnector's version is quite long:

select distinct sca1.attr_value, sca2.attr_value
from information_schema.processlist pl
    inner join performance_schema.session_connect_attrs sca1 on pl.id = sca1.processlist_id
    inner join performance_schema.session_connect_attrs sca2 on pl.id = sca2.processlist_id
where sca1.attr_name = '_client_name' and sca2.attr_name = '_client_version';

attr_value	attr_value
libmysql	5.7.24-27
MySql Connector/NET	6.9.9.0
mysql-connector-net	8.0.19.0
MySqlConnector	0.61.0+5462263e11a7b41b9cec636ce20e2bb43d465378

The git commit SHA suffix should be trimmed off.

[bgrainger]

Fixed in 0.62.0.