[6.x] Fix for dropping columns when using MSSQL as database

[SyotaOkaniwaITR]

When using MSSQL as the database for an application you are unable to drop columns.

    $table->dropColumn('name');

The error received is

SQLSTATE[42S02]: [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]Invalid object name 'SYS.COLUMNS'. (SQL: DECLARE @sql NVARCHAR(MAX) = '';SELECT @sql += 'ALTER TABLE...

This is due to the MSSQL system table must be select in lowercase.

However, if you select the option (_CI) that ignores the difference between uppercase and lowercase letters in the COLLATE option, no error occurs.
The error only occurs if you select the case-sensitive option (_CS).

Related Pull Request: #37308

[driesvints]

@sokaniwa which SQL Server version are you using?

[SyotaOkaniwaITR]

@driesvints
Microsoft SQL Server 2019 (RTM-CU13) (KB5005679) - 15.0.4178.1 (X64) Sep 23 2021 16:47:49 Copyright (C) 2019 Microsoft Corporation Developer Edition (64-bit) on Linux (Ubuntu 20.04.3 LTS)