Tests

fix: enforce string-only keys in `.attrs` #3173

Job	Run time
Linux-cppyy	56s
Linux-ROOT	1m 16s
Run Tests (windows-latest, 3.13, x64, full)	1s
Run Tests (windows-latest, 3.12, x64, full)	9s
Run Tests (windows-latest, 3.11, x64, full)	1s
Run Tests (windows-latest, 3.10, x64, full)	1s
Run Tests (windows-latest, 3.9, x64, full)	1s
Run Tests (ubuntu-latest, 3.13, x64, full)	12s
Run Tests (ubuntu-latest, 3.12, x64, full)	47s
Run Tests (ubuntu-latest, 3.11, x64, full)	57s
Run Tests (ubuntu-latest, 3.10, x64, full)	1m 14s
Run Tests (ubuntu-latest, 3.9, x64, full)	1s
Run Tests (macos-13, 3.13, x64, full)	58s
Run Tests (macos-13, 3.12, x64, full)	1m 18s
Run Tests (macos-13, 3.11, x64, full)	1m 17s
Run Tests (macos-13, 3.10, x64, full)	1m 20s
Run Tests (macos-13, 3.9, x64, full)	1s
Run Tests (3.9, x86, windows-latest, full)	59s
Run Tests (3.9, x86, windows-latest, numpy1)	59s
Run Tests (3.9, x64, ubuntu-latest, minimal)	1m 13s
Run Tests (pypy3.9, x64, ubuntu-latest, pypy)	1m 7s
Run Tests (3.11, x64, ubuntu-latest, ml)	1m 14s
pass-tests	2s
	16m 4s

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