Rename speed test file to avoid Pytest discovering it on older Pythons #90

Job	Run time
pylint	14s
test_on_EOL_Pythons (3.6)	5m 54s
test_on_EOL_Pythons (3.5)	5m 54s
test_on_EOL_Pythons (3.8)	4m 57s
pre-commit	10s
test_on_EOL_Pythons (2.7)	7m 0s
test_on_EOL_Pythons (3.7)	5m 24s
test_on_supported_Pythons (3.9, macos-latest)	3m 22s
test_on_supported_Pythons (3.10, windows-latest)	4m 10s
test_on_supported_Pythons (3.9, ubuntu-24.04)	4m 15s
test_on_supported_Pythons (3.11, macos-latest)	2m 34s
test_on_supported_Pythons (3.11, windows-latest)	3m 59s
test_on_supported_Pythons (3.10, ubuntu-24.04)	4m 7s
test_on_supported_Pythons (3.11, ubuntu-24.04)	3m 17s
test_on_supported_Pythons (3.10, macos-latest)	2m 44s
test_on_supported_Pythons (3.12, macos-latest)	2m 16s
test_on_supported_Pythons (3.9, windows-latest)	4m 4s
test_on_supported_Pythons (3.12, windows-latest)	4m 13s
test_on_supported_Pythons (3.13, ubuntu-24.04)	3m 36s
test_on_supported_Pythons (3.14.0-beta.4, macos-latest)	2m 49s
test_on_supported_Pythons (3.13, macos-latest)	2m 39s
test_on_supported_Pythons (3.14.0-beta.4, windows-latest)	5m 11s
test_on_supported_Pythons (3.12, ubuntu-24.04)	4m 3s
test_on_supported_Pythons (3.13, windows-latest)	3m 53s
test_on_supported_Pythons (3.14.0-beta.4, ubuntu-24.04)	4m 2s
	1h 34m 47s

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