ARROW-9845: [Rust] [Parquet] Move serde_json dependency to dev-dependencies as it is only used in tests
ARROW-9845: [Rust] [Parquet] Move serde_json dependency to dev-dependencies as it is only used in tests

This PR is a cherry pick of f2e79ca712a3ae5617526a4b4db7f550f25b2897 by @saethlin against latest master (to get a clean CI run) as suggested https://github.com/apache/arrow/pull/8042#issuecomment-683797840

Closes #8087 from alamb/alamb/ARROW-9845-dependencies

Authored-by: Ben Kimock <97fcdf96ba118620f057ee63b740f1a25c087e96@gmail.com>
Signed-off-by: Andy Grove <f68909d51919859739a1c5d24450a2cc1026e93b@gmail.com>

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