mypy annotation for `test_dos.py` #30783

Job	Run time
version / identify version	29s
Build amd64 RPM (3.10, intel)	16m 1s
Test amazonlinux:2023 GUI Dirty	1m 8s
Test amazonlinux:2023 GUI Clean	53s
Test amazonlinux:2023 CLI Dirty	34s
Test amazonlinux:2023 CLI Clean	34s
Test fedora:37 GUI Dirty	1m 17s
Test fedora:37 GUI Clean	1m 17s
Test fedora:37 CLI Dirty	2m 1s
Test fedora:37 CLI Clean	1m 1s
Test fedora:38 GUI Dirty	1m 24s
Test fedora:38 GUI Clean	1m 23s
Test fedora:38 CLI Dirty	1m 3s
Test fedora:38 CLI Clean	1m 26s
Test rockylinux:8 GUI Dirty	1m 0s
Test rockylinux:8 GUI Clean	48s
Test rockylinux:8 CLI Dirty	42s
Test rockylinux:8 CLI Clean	55s
Test rockylinux:9 GUI Dirty	1m 24s
Test rockylinux:9 GUI Clean	1m 11s
Test rockylinux:9 CLI Dirty	50s
Test rockylinux:9 CLI Clean	37s
Test build image GUI Dirty	1m 34s
Test build image GUI Clean	1m 20s
Test build image CLI Dirty	1m 13s
Test build image CLI Clean	1m 16s
📦 Publish Installers (3.10, redhat, RPM, rpm, rpm, linux, x86_64, chia-blockchain-cli-{0}-1.{2}.... / Publish Intel GUI RPM	24s
📦 Publish Installers (3.10, redhat, RPM, rpm, rpm, linux, x86_64, chia-blockchain-cli-{0}-1.{2}.... / Publish Intel CLI RPM	24s
	44m 9s

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