Update dependency connection-string to v3.4.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
connection-string	dependencies	minor	3.3.1 -> 3.4.0

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Release Notes

vitaly-t/connection-string

v3.4.0

Compare Source

• Implemented #​33, to allow constructor with null / undefined for connection string, to be treated the same as an empty string.

The following initializations will produce the same result:

new ConnectionString();
new ConnectionString(null);
new ConnectionString('');

• DEV dependencies updated
• Minor code refactoring

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