Bump actions/download-artifact from 4.1.8 to 4.1.9 #1447

Job	Run time
Pre-commit checks / Pre-commit Checks	19s
Check towncrier / Towncrier Checks	21s
Package Rubicon-ObjC / Create Python Package	14s
Unit tests (macos-13, 3.9)	40s
Unit tests (macos-13, 3.10)	46s
Unit tests (macos-13, 3.11)	43s
Unit tests (macos-13, 3.12)	54s
Unit tests (macos-13, 3.13)	46s
Unit tests (macos-13, 3.14)	1m 38s
Unit tests (macos-14, 3.10)	51s
Unit tests (macos-14, 3.11)	29s
Unit tests (macos-14, 3.12)	28s
Unit tests (macos-14, 3.13)	30s
Unit tests (macos-14, 3.14)	46s
Unit tests (macos-15, 3.10)	41s
Unit tests (macos-15, 3.11)	26s
Unit tests (macos-15, 3.12)	27s
Unit tests (macos-15, 3.13)	27s
Unit tests (macos-15, 3.14)	55s
	12m 21s

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