fix: rename `.gitattribute` to `.gitattributes` so git actually reads it #2197

Job	Run time
checks / readme-snippets	11s
checks / pre-commit	36s
checks / test (3.11, lowest-direct, windows-latest)	3m 13s
checks / test (3.11, locked, ubuntu-latest)	52s
checks / test (3.11, locked, windows-latest)	3m 6s
checks / test (3.10, locked, windows-latest)	1m 56s
checks / test (3.11, lowest-direct, ubuntu-latest)	54s
checks / test (3.10, locked, ubuntu-latest)	54s
checks / test (3.10, lowest-direct, windows-latest)	2m 18s
checks / test (3.13, lowest-direct, ubuntu-latest)	53s
checks / test (3.12, lowest-direct, windows-latest)	3m 44s
checks / test (3.13, locked, windows-latest)	2m 19s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 22s
checks / test (3.10, lowest-direct, ubuntu-latest)	58s
checks / test (3.12, locked, windows-latest)	3m 23s
checks / test (3.14, locked, windows-latest)	3m 45s
checks / test (3.14, lowest-direct, windows-latest)	2m 16s
checks / test (3.13, locked, ubuntu-latest)	52s
checks / test (3.12, locked, ubuntu-latest)	59s
checks / test (3.13, lowest-direct, windows-latest)	3m 0s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 2s
checks / test (3.14, locked, ubuntu-latest)	2m 21s
all-green	2s
	40m 56s

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