fix: preserve column names with spaces in wr.redshift.copy()

[hirenkumar-n-dholariya]

Problem

wr.redshift.copy() silently renames columns with spaces (e.g. "my col" → "my_col")
because the internal s3.to_parquet call defaults to pyarrow flavor='spark',
which sanitizes column names.

Fix

Explicitly pass pyarrow_additional_kwargs={"flavor": None} in the internal
s3.to_parquet call to preserve original column names.

Fixes #3293

[kukushking]

AWS CodeBuild CI Report

• CodeBuild project: GitHubDistributedCodeBuild6-jWcl5DLmvupS
• Commit ID: fdccae4
• Result: FAILED
• Build Logs (available for 30 days)

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[kukushking]

AWS CodeBuild CI Report

• CodeBuild project: GitHubCodeBuild8756EF16-4rfo0GHQ0u9a
• Commit ID: fdccae4
• Result: SUCCEEDED
• Build Logs (available for 30 days)

Powered by github-codebuild-logs, available on the AWS Serverless Application Repository

[hirenkumar-dholariya]

AWS CodeBuild CI Report

• CodeBuild project: GitHubDistributedCodeBuild6-jWcl5DLmvupS
• Commit ID: fdccae4
• Result: FAILED
• Build Logs (available for 30 days)

Powered by github-codebuild-logs, available on the AWS Serverless Application Repository

@kukushking Could you confirm this failure is pre-existing and unrelated to the fix? Happy to address any other feedback!
The CI failure is unrelated to this fix. The GitHubDistributedCodeBuild failure is caused by a pre-existing incompatibility between modin==0.37.1 and pandas==3.0.1 — pandas.read_gbq was removed in pandas 3.x, which causes an AttributeError when loading modin.

The GitHubCodeBuild (non-distributed) pipeline passed successfully.
This issue exists independently in the main branch and is not introduced by this PR.

[hirenkumar-n-dholariya]

@kukushking Could you confirm this failure is pre-existing and unrelated to the fix? Happy to address any other feedback! The CI failure is unrelated to this fix. The GitHubDistributedCodeBuild failure is caused by a pre-existing incompatibility between modin==0.37.1 and pandas==3.0.1 — pandas.read_gbq was removed in pandas 3.x, which causes an AttributeError when loading modin.

The GitHubCodeBuild (non-distributed) pipeline passed successfully. This issue exists independently in the main branch and is not introduced by this PR.

@kukushking Could you confirm this failure is pre-existing and unrelated to the fix? Happy to address any other feedback!
The CI failure is unrelated to this fix. The GitHubDistributedCodeBuild failure is caused by a pre-existing incompatibility between modin==0.37.1 and pandas==3.0.1 — pandas.read_gbq was removed in pandas 3.x, which causes an AttributeError when loading modin.

The GitHubCodeBuild (non-distributed) pipeline passed successfully.
This issue exists independently in the main branch and is not introduced by this PR.