Bump actions/setup-python from 5.4.0 to 5.5.0 #1482

Job	Run time
Check towncrier / Towncrier Checks	19s
Pre-commit checks / Pre-commit Checks	16s
Package Rubicon-ObjC / Create Python Package	16s
Unit tests (macos-13, 3.10)	47s
Unit tests (macos-13, 3.9)	49s
Unit tests (macos-13, 3.11)	55s
Unit tests (macos-13, 3.12)	44s
Unit tests (macos-13, 3.14)	1m 30s
Unit tests (macos-13, 3.13)	47s
Unit tests (macos-15, 3.14)	47s
Unit tests (macos-14, 3.13)	27s
Unit tests (macos-14, 3.12)	27s
Unit tests (macos-15, 3.11)	28s
Unit tests (macos-15, 3.13)	26s
Unit tests (macos-14, 3.14)	45s
Unit tests (macos-14, 3.10)	39s
Unit tests (macos-14, 3.11)	27s
Unit tests (macos-15, 3.10)	41s
Unit tests (macos-15, 3.12)	26s
	11m 56s

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