Bump actions/download-artifact from 4.1.8 to 4.1.9 (#571) #1451

Job	Run time
Pre-commit checks / Pre-commit Checks	42s
Check towncrier / Towncrier Checks	24s
Package Rubicon-ObjC / Create Python Package	15s
Unit tests (macos-13, 3.9)	54s
Unit tests (macos-13, 3.10)	44s
Unit tests (macos-13, 3.11)	43s
Unit tests (macos-13, 3.12)	44s
Unit tests (macos-13, 3.13)	43s
Unit tests (macos-13, 3.14)	1m 36s
Unit tests (macos-14, 3.10)	49s
Unit tests (macos-14, 3.11)	31s
Unit tests (macos-14, 3.12)	30s
Unit tests (macos-14, 3.13)	32s
Unit tests (macos-14, 3.14)	1m 2s
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)	23s
Unit tests (macos-15, 3.14)	52s
	12m 58s

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