ci(conformance): bump harness to 0.2.0-alpha.5 preview #2848

Job	Run time
checks / pre-commit	40s
checks / readme-snippets	16s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 5s
checks / test (3.13, locked, ubuntu-latest)	54s
checks / test (3.13, locked, windows-latest)	1m 24s
checks / test (3.14, lowest-direct, windows-latest)	1m 57s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 5s
checks / test (3.14, locked, windows-latest)	2m 42s
checks / test (3.13, lowest-direct, ubuntu-latest)	59s
checks / test (3.14, lowest-direct, ubuntu-latest)	58s
checks / test (3.13, lowest-direct, windows-latest)	1m 28s
checks / test (3.10, locked, windows-latest)	1m 42s
checks / test (3.11, locked, windows-latest)	1m 32s
checks / test (3.10, lowest-direct, windows-latest)	1m 38s
checks / test (3.10, locked, ubuntu-latest)	59s
checks / test (3.11, locked, ubuntu-latest)	59s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 7s
checks / test (3.12, lowest-direct, windows-latest)	1m 30s
checks / test (3.11, lowest-direct, windows-latest)	1m 41s
checks / test (3.12, locked, ubuntu-latest)	1m 4s
checks / test (3.12, locked, windows-latest)	1m 55s
checks / test (3.14, locked, ubuntu-latest)	2m 2s
all-green	2s
	29m 39s

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