Fix clippy lints introduced in rust 1.53

[alamb]

Which issue does this PR close?

Closes #467

I started on getting clippy CI running again but ran out of time this morning. Will finish up tomorrow if no one beats me to it

Rationale for this change

Rust upgrade cases lots of clippy errors

What changes are included in this PR?

Do what clippy says

Are there any user-facing changes?

No

[codecov-commenter]

Codecov Report

Merging #469 (7b14af8) into master (1f1c637) will increase coverage by 0.00%.
The diff coverage is 99.64%.

❗ Current head 7b14af8 differs from pull request most recent head 57b5cb6. Consider uploading reports for the commit 57b5cb6 to get more accurate results

@@           Coverage Diff           @@
##           master     #469   +/-   ##
=======================================
  Coverage   82.65%   82.66%           
=======================================
  Files         165      165           
  Lines       45563    45556    -7     
=======================================
- Hits        37662    37657    -5     
+ Misses       7901     7899    -2     

Impacted Files	Coverage Δ
parquet/src/arrow/array_reader.rs	77.31% <ø> (ø)
arrow/src/json/reader.rs	84.01% <97.56%> (+0.10%)	⬆️
arrow/src/array/array_binary.rs	90.13% <100.00%> (ø)
arrow/src/array/array_boolean.rs	90.90% <100.00%> (ø)
arrow/src/array/array_dictionary.rs	84.56% <100.00%> (ø)
arrow/src/array/array_primitive.rs	94.70% <100.00%> (ø)
arrow/src/array/array_struct.rs	88.43% <100.00%> (ø)
arrow/src/array/array_union.rs	86.93% <100.00%> (ø)
arrow/src/array/builder.rs	85.90% <100.00%> (ø)
arrow/src/array/equal/mod.rs	93.58% <100.00%> (ø)
... and 21 more

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[jimexist]

I started on getting clippy CI running again but ran out of time this morning. Will finish up tomorrow if no one beats me to it

😄 I got the similar fix in #470

[Dandandan]

Closed by #470