DEPRECATED_UART_NRFX_UARTE_LEGACY_SHIM after Upgrading to SDK v3.0.2

I am in the process of upgrading from SDK v2.9.1 to v3.0.2. When building, I get the following warning:

warning: Deprecated symbol DEPRECATED_UART_NRFX_UARTE_LEGACY_SHIM is enabled.

How can I get rid of this warning?

I found  warning: Deprecated symbol DEPRECATED_UART_NRFX_UARTE_LEGACY_SHIM is enabled. but there is no answer as how to get rid of the warning. I also have CONFIG_SERIAL set to y. The referenced link seems not to set CONFIG_SERIAL though...

Many thanks in advance!

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