This patch-level release fixes the issues with interrupt-driven serial IO when multicore operation has been initiated on the Raspberry Pi Pico, where previously multicore operation required interrupt-driven serial IO to be disabled prior to booting the second core. Additionally, critical sections have been added to interrupt-driven serial IO and the swdcom driver to reduce (but not eliminate) the chance of RX and TX buffer state corruption when multiple tasks are attempting to transmit or receive bytes simultaneously.