Fix USB CDC stability issue when sending data #57

Job	Run time
Build Website	28s
Dry Run Packaging	57s
Build Examples (espressif/esp)	2m 13s
Check that stm32 generated code is up to date	38s
Build Examples (gigadevice/gd32)	2m 16s
Build Examples (microchip/avr)	2m 16s
Unit Test Ports (ubuntu-latest, gigadevice/gd32)	17s
Unit Test Regz (ubuntu-latest)	17s
Unit Test Ports (ubuntu-latest, raspberrypi/rp2xxx)	26s
Build Examples (microchip/atsam)	1m 58s
Unit Test Regz (windows-latest)	1m 24s
Unit Test UF2 (ubuntu-latest)	17s
Unit Test Ports (ubuntu-latest, stmicro/stm32)	27s
Build Examples (nordic/nrf5x)	2m 2s
Unit Test Regz (macos-latest)	26s
Unit Test Ports (windows-latest, gigadevice/gd32)	1m 34s
Unit Test UF2 (windows-latest)	1m 19s
Build Examples (nxp/lpc)	2m 4s
Unit Test Ports (windows-latest, raspberrypi/rp2xxx)	1m 1s
Build Examples (stmicro/stm32)	26s
Unit Test UF2 (macos-latest)	24s
Unit Test Ports (windows-latest, stmicro/stm32)	56s
Build Examples (raspberrypi/rp2xxx)	2m 28s
Unit Test Ports (macos-latest, gigadevice/gd32)	24s
Build Examples (wch/ch32v)	2m 18s
Unit Test Ports (macos-latest, raspberrypi/rp2xxx)	44s
Unit Test Ports (macos-latest, stmicro/stm32)	27s
	30m 27s

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