Upgrade Databricks JDBC driver to 2.6.29

[ebyhr]

Description

Testing if new JDBC driver resolves #14391
Download Databricks JDBC driver release-notes

Non-technical explanation

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# Section
* Fix some things. ({issue}`issuenumber`)

[ebyhr]

Closing as upgrading the JDBC driver didn't help.

tests               | 2022-10-05 23:15:58 INFO: FAILURE     /    io.trino.tests.product.deltalake.TestDeltaLakeTransactionLogCache.testAllDataFilesAreLoadedWhenTransactionLogFileAfterTheCachedTableVersionIsMissing (Groups: profile_specific_tests, delta-lake-databricks, delta-lake-oss) took 11.7 seconds
tests               | 2022-10-05 23:15:58 SEVERE: Failure cause:
tests               | io.trino.tempto.query.QueryExecutionException: java.sql.SQLException: [Databricks][DatabricksJDBCDriver](500593) Communication link failure. Failed to connect to server. Reason: HTTP retry after response received with no Retry-After header, error: HTTP Response code: 503, Error message: Unknown.