Dockerfile for generating TPC-DS data not working

Run `docker build -t datafusion-benchmarks/tpcdsgen .` according to the README.md under `tpcds`. `tpctools v0.7.0` cannot be built currently.

```
8.751 error: failed to compile `tpctools v0.7.0`, intermediate artifacts can be found at `/tmp/cargo-installh8gWdE`.
8.751 To reuse those artifacts with a future compilation, set the environment variable `CARGO_TARGET_DIR` to that path.
8.751
8.751 Caused by:
8.751 rustc 1.79.0 is not supported by the following packages:
8.751 half@2.5.0 requires rustc 1.81
8.751 litemap@0.7.5 requires rustc 1.81
8.751 zerofrom@0.1.6 requires rustc 1.81
8.751 Try re-running `cargo install` with `--locked`
```

The rustc in the image is too old to built `tpctools v0.7.0`. Although I upgraded it immediately, it doesn't make the Dockerfile work because there are more issues.