Bump version to 6.1.17a1 #563

Job	Run time
build (MarlinFirmware/Marlin, Marlin, Marlin, mega2560, ubuntu-latest)	42s
build (MarlinFirmware/Marlin, Marlin, Marlin, mega2560, windows-latest)	1m 22s
build (MarlinFirmware/Marlin, Marlin, Marlin, mega2560, macos-latest)	55s
build (scottbez1/smartknob, smartknob, smartknob, view, ubuntu-latest)	1m 18s
build (scottbez1/smartknob, smartknob, smartknob, view, windows-latest)	2m 43s
build (scottbez1/smartknob, smartknob, smartknob, view, macos-latest)	1m 55s
build (xoseperez/espurna, espurna, espurna/code, nodemcu-lolin, ubuntu-latest)	2m 38s
build (xoseperez/espurna, espurna, espurna/code, nodemcu-lolin, windows-latest)	3m 32s
build (xoseperez/espurna, espurna, espurna/code, nodemcu-lolin, macos-latest)	3m 38s
build (1technophile/OpenMQTTGateway, OpenMQTTGateway, OpenMQTTGateway, esp32-m5atom-lite, ubuntu-...	1m 52s
build (1technophile/OpenMQTTGateway, OpenMQTTGateway, OpenMQTTGateway, esp32-m5atom-lite, windows...	5m 15s
build (1technophile/OpenMQTTGateway, OpenMQTTGateway, OpenMQTTGateway, esp32-m5atom-lite, macos-l...	2m 1s
	27m 51s

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