Add automated weekly dependency update workflow #248

Job	Run time
build-captive-portal	43s
get-targets / generate-matrix	7s
build-firmware (Wemos-D1-Mini-ESP32)	1m 43s
build-firmware (Wemos-Lolin-S2-Mini)	2m 0s
build-firmware (Wemos-Lolin-S3)	2m 23s
build-firmware (Pishock-2023)	1m 32s
build-firmware (Pishock-Lite-2021)	1m 28s
build-firmware (Seeed-Xiao-ESP32S3)	1m 53s
build-filesystem	47s
merge-images (Wemos-D1-Mini-ESP32)	35s
merge-images (Wemos-Lolin-S2-Mini)	22s
merge-images (Wemos-Lolin-S3)	34s
merge-images (Pishock-2023)	33s
merge-images (Pishock-Lite-2021)	36s
merge-images (Seeed-Xiao-ESP32S3)	25s
done	3s
	15m 44s

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