chore: update testcontainers and astral-tokio-tar for cargo audit (#21114)

## Which issue does this PR close?

- N/A

## Rationale for this change

`cargo audit --ignore RUSTSEC-2024-0014` started failing due to
`RUSTSEC-2026-0066` in `astral-tokio-tar 0.5.6`, which was pulled in
transitively through `testcontainers`.

As a result, the `Security audit` GitHub Actions workflow is currently
failing on this dependency resolution.

This change only updates `Cargo.lock` because the existing version
requirements in `Cargo.toml` already allow a safe resolution.
Re-resolving the lockfile is enough to move from `testcontainers 0.27.1`
to `0.27.2`, which in turn updates `astral-tokio-tar` from `0.5.6` to
`0.6.0`.

## What changes are included in this PR?

- Updated `Cargo.lock`
- Resolved `testcontainers` from `0.27.1` to `0.27.2`
- Updated transitive `astral-tokio-tar` from `0.5.6` to `0.6.0`

## Are these changes tested?

Yes.

- `cargo test -p datafusion-cli`
- `cargo audit --ignore RUSTSEC-2024-0014`

## Are there any user-facing changes?

No.

This PR was created with the help of a coding agent.

Author: getChan