fix(JdbcChatMemory): get query for MSSQL Server

[xchopin]

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Fix the GET query for Microsoft SQL Server on JdbcChatMemory

I have tried to make the less changes, I was thinking at first to change with Impl classes and make a @OnConditionalClass("sql driver") but that would break too many things as it introduces the class a Component.

I hope the way I have fixed the issue fits the Spring standards, if not I will do the necessary.

Happy to contribute!

Related issue: #2807