DBAL-712: [GH-451] Fix deprecated CLOB type declaration in SQL Server platform

[doctrinebot]

Jira issue originally created by user @doctrinebot:

This issue is created automatically through a Github pull request on behalf of deeky666:

Url: #451

Message:

According to the SQL Server documentation the text type declaration is deprecated and will be removed in the future. It is encouraged to use varchar(max) instead. This has been applied to SQLServerPlatform::getClobTypeDeclarationSQL() by this PR.
The varchar(max) declaration is BC for all SQL Server versions supported by Doctrine btw.

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-451] was closed:
#451

[doctrinebot]

Issue was closed with resolution "Fixed"

[github-actions]

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