ci(conformance): bump harness to 0.2.0-alpha.5 preview #2846

Job	Run time
checks / pre-commit	49s
checks / readme-snippets	14s
checks / test (3.10, locked, ubuntu-latest)	1m 9s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 7s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 5s
checks / test (3.10, lowest-direct, windows-latest)	1m 38s
checks / test (3.11, lowest-direct, windows-latest)	1m 56s
checks / test (3.13, locked, windows-latest)	2m 4s
checks / test (3.12, lowest-direct, windows-latest)	1m 41s
checks / test (3.14, locked, windows-latest)	2m 35s
checks / test (3.13, locked, ubuntu-latest)	54s
checks / test (3.11, locked, windows-latest)	1m 46s
checks / test (3.10, locked, windows-latest)	1m 34s
checks / test (3.11, locked, ubuntu-latest)	1m 3s
checks / test (3.12, locked, ubuntu-latest)	1m 3s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 3s
checks / test (3.12, locked, windows-latest)	1m 35s
checks / test (3.14, lowest-direct, windows-latest)	1m 33s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 5s
checks / test (3.13, lowest-direct, windows-latest)	1m 32s
checks / test (3.14, lowest-direct, ubuntu-latest)	55s
checks / test (3.14, locked, ubuntu-latest)	2m 1s
all-green	2s
	30m 24s

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