ARROW-13453: [R] DuckDB has not yet released 0.2.8
ARROW-13453: [R] DuckDB has not yet released 0.2.8

Closes #10807 from jonkeane/ARROW-13453-duckdb-version

Authored-by: Jonathan Keane <28d17c45cab2bb8b25bea44a915713e26ce37e1b@gmail.com>
Signed-off-by: Jonathan Keane <28d17c45cab2bb8b25bea44a915713e26ce37e1b@gmail.com>

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