ARROW-7006: [Rust] Bump flatbuffers version to avoid vulnerability
ARROW-7006: [Rust] Bump flatbuffers version to avoid vulnerability

Closes #5744 from paddyhoran/bump-flatbuffers and squashes the following commits:

d98e496e0 <Paddy Horan> Bumps flat buffers version

Authored-by: Paddy Horan <e3329cc3e496dc07f33f8b36f2d1ccb51669f92b@hotmail.com>
Signed-off-by: Paddy Horan <e3329cc3e496dc07f33f8b36f2d1ccb51669f92b@hotmail.com>

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