Updated Spring Framework to 5.3.18

Unexpected results would occur when the "ServerExportCSVMaxRowsByCols" value setting exceeded the number of headers in the view.

Flows published by Prep web authoring with TabPy scripts could fail to run with the error, "The specified script file doesn't exist. Browser to select a different script to run." The same flow published from Tableau Prep Builder would work without error.

With the ATR activation method, an ATR lease would sometimes not refresh after a timeout failure connecting to ATR Service.

The error, "Unrecognized Format Changes" could occur when connecting to a published data source from Databricks which was created or changed on Server.

The number of unlicensed users displayed on the Server Users page for "All Sites" could be incorrect after an upgrade. The Users filter option showed the correct number of unlicensed users.

Slack integration could fail when a proxy server was used.

The virtual connection editor when defining policies could give an error, "Query polling failed: INTERNAL: Connecting to gRPC service-url 'services/monolith_grpc' threw a TableauException: Service discovery found no usable service instances.

Using the Phantom extension could cause an error, "Uncaught TypeError: Cannot read properties of undefined (reading 'config')."

The virtual connection publish option would skip from "a" to "f" in the list of folders.

On a Windows operating system, the following error would sometimes display at the end of the "Run installer" step for Tableau Server 2021.4.5: "Error running Python config routine - Error code: 2".