fix: bump microsoft/action-python/.github/workflows/validation.yml from 0.6.4 to 0.7.3 #380

Job	Run time
publish / publish	32s
validation / validation (pytest, -m integration)	56s
validation / validation (pytest, -m not integration and not gpu)	1m 22s
validation / validation (black)	21s
validation / validation (bandit)	29s
validation / validation (flake8)	26s
validation / validation (pylint)	50s
	4m 56s

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