fix: rename `.gitattribute` to `.gitattributes` so git actually reads it #2431

Job	Run time
checks / pre-commit	33s
checks / readme-snippets	12s
checks / test (3.10, locked, windows-latest)	2m 31s
checks / test (3.12, locked, ubuntu-latest)	1m 2s
checks / test (3.10, locked, ubuntu-latest)	1m 5s
checks / test (3.13, locked, ubuntu-latest)	1m 5s
checks / test (3.11, locked, ubuntu-latest)	59s
checks / test (3.10, lowest-direct, windows-latest)	2m 55s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 9s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 7s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 13s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 6s
checks / test (3.11, locked, windows-latest)	3m 6s
checks / test (3.12, locked, windows-latest)	3m 55s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 35s
checks / test (3.13, locked, windows-latest)	3m 2s
checks / test (3.14, lowest-direct, windows-latest)	3m 3s
checks / test (3.14, locked, windows-latest)	3m 26s
checks / test (3.14, locked, ubuntu-latest)	2m 35s
checks / test (3.13, lowest-direct, windows-latest)	3m 2s
checks / test (3.12, lowest-direct, windows-latest)	3m 10s
checks / test (3.11, lowest-direct, windows-latest)	3m 0s
all-green	5s
	44m 56s

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