Update pico-sdk to 1.4.0

Doing so removes the need for the CFG_TUD_EP_MAX modification in the README. Also sdk 1.4.0 seems to remove data loss that would occur when all 6x ports are receiving at 115200 baud. There will be a subsequent commit that would have fixed the issues had we remained on 1.0.1
JoeSc · Sep 22, 2022 · 005458a · 005458a
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diff --git a/README.md b/README.md
@@ -1,11 +1,6 @@
 Raspberry Pi Pico USB-HW_and_PIO-UART Bridge
 =================================
 This expands Noltari's project to add 4 additional UARTs using the pico PIOs.
-It requires a "fix" in tinyusb - ~/pico/pico-sdk/lib/tinyusb/src/device/usbd.c (thanks hippy)
-
-#define CFG_TUD_EP_MAX          15
-
-The PIO uarts are currently all 8x1. They will support but not check odd/even/no parity bit
 
 Raspberry Pi Pico USB-UART Bridge
 =================================

diff --git a/pico-sdk b/pico-sdk