[skip ci] Re-unparallelize odbc tests

SQL Server frequently deadlocks. Parallelization of these jobs, at least in CI,
is not worthwhile because there are enough tests to run in parallel

[skip ci] Re-unparallelize odbc tests

SQL Server frequently deadlocks. Parallelization of these jobs, at least in CI,
is not worthwhile because there are enough tests to run in parallel for the few
workers available.

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