Dockerfile build failure

[giulio1979]

I notice latest builds failing:

error[E0658]: use of unstable library feature 'arc_unwrap_or_clone'
--> /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/delta_kernel-0.1.1/src/schema.rs:461:9
|
461 | Arc::unwrap_or_clone(schema).into()
| ^^^^^^^^^^^^^^^^^^^^
|
= note: see issue #93610 rust-lang/rust#93610 for more information
For more information about this error, try rustc --explain E0658.
error: could not compile delta_kernel (lib) due to previous error
warning: build failed, waiting for other jobs to finish...