Simplify recursion in ObjCClass method loading #1381

Job	Run time
Pre-commit checks / Pre-commit Checks	17s
Check towncrier / Towncrier Checks	28s
Package Rubicon-ObjC / Create Python Package	17s
Unit tests (macos-13, 3.9)	54s
Unit tests (macos-13, 3.10)	47s
Unit tests (macos-13, 3.11)	48s
Unit tests (macos-13, 3.12)	46s
Unit tests (macos-13, 3.13)	1m 8s
Unit tests (macos-13, 3.14)	2m 25s
Unit tests (macos-14, 3.10)	42s
Unit tests (macos-14, 3.11)	25s
Unit tests (macos-14, 3.12)	30s
Unit tests (macos-14, 3.13)	26s
Unit tests (macos-14, 3.14)	45s
Unit tests (macos-15, 3.10)	45s
Unit tests (macos-15, 3.11)	26s
Unit tests (macos-15, 3.12)	27s
Unit tests (macos-15, 3.13)	33s
Unit tests (macos-15, 3.14)	45s
	13m 34s

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