MINOR: Fix test_row_type_validation test

[viirya]

Which issue does this PR close?

Closes #.

Rationale for this change

Since serde_json 1.0.84+, test_row_type_validation fails.

---- json::reader::tests::test_row_type_validation stdout ----                                                     
thread 'json::reader::tests::test_row_type_validation' panicked at 'assertion failed: `(left == right)`                                                                                                                                
  left: `"Json error: Expected JSON record to be an object, found Array [Number(1), String(\"hello\")]"`,                                                                                                                              
 right: `"Json error: Expected JSON record to be an object, found Array([Number(1), String(\"hello\")])"`', arrow/src/json/reader.rs:2624:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace                                   

This is to update the test.

What changes are included in this PR?

Are there any user-facing changes?

[ursabot]

Benchmark runs are scheduled for baseline = 34216d5 and contender = dc1448e. dc1448e is a master commit associated with this PR. Results will be available as each benchmark for each run completes.
Conbench compare runs links:
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ec2-t3-xlarge-us-east-2] ec2-t3-xlarge-us-east-2
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on test-mac-arm] test-mac-arm
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ursa-i9-9960x] ursa-i9-9960x
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ursa-thinkcentre-m75q] ursa-thinkcentre-m75q
Buildkite builds:
Supported benchmarks:
ec2-t3-xlarge-us-east-2: Supported benchmark langs: Python, R. Runs only benchmarks with cloud = True
test-mac-arm: Supported benchmark langs: C++, Python, R
ursa-i9-9960x: Supported benchmark langs: Python, R, JavaScript
ursa-thinkcentre-m75q: Supported benchmark langs: C++, Java

[alamb]

Mailing list context for anyone else who is curious: https://lists.apache.org/thread/7z4x99vlc8cgncf644x1dc7sdmz6np3p (this was found while verifying arrow 21.0.0)