ARROW-14489: [Rust][CI] Install stable rust toolchain in the integration docker image
ARROW-14489: [Rust][CI] Install stable rust toolchain in the integration docker image

otherwise [downstream pull request][1] will be blocked at 1.55 rust version

[1]: https://github.com/apache/arrow-rs/pull/591

Closes #11557 from Jimexist/update-conda-integration

Lead-authored-by: Jiayu Liu <42c794500358d54ef2b843e66260ca6e2bc19e03@airbnb.com>
Co-authored-by: Krisztián Szűcs <6bab32dc957a05a87930e779f272342e159326fa@gmail.com>
Signed-off-by: Krisztián Szűcs <6bab32dc957a05a87930e779f272342e159326fa@gmail.com>

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