It depends on the target device, which is mounted to the NUCLEO-64.
Just to take the example of a NUCLEO-G071RB, where the target MCU is the STM32G071RB, you will find these currents in the datasheet of that target device. Please keep in mind that Absolute Maximum Ratings is not identical to usual working conditions!
You will find the working conditions in section 5.3.14, I/O port characteristics and the output driving current with up to ±6mA, and up to ±15mA with relaxed VOL/VOH.
Of course the sum of all currents from all GPIOs at the same time is limited, in this case to 80mA, as mentioned in table 19.
BTW: you can increase the current per "channel" if you connect GPIOs together and drive them with exactly the same pattern, which means you may not need an external transistor/driver.
Good luck!
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/Peter
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