fix: region tags in create_mysql_connection.py

[loferris]

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[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• samples/snippets/create_mysql_connection.py:15, tag bigqueryconnection_create_connection

You are about to delete 1 region tag.

• samples/snippets/create_mysql_connection.py:15, tag bigqueryconnection_connection_create

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