alamb opened a new pull request, #11778:
URL: https://github.com/apache/arrow-rs/pull/11778

   # Which issue does this PR close?
   
   - N/A, CI fix for `58_maintenance`. Same change as #11777 on 
`57_maintenance`.
   
   # Rationale for this change
   
   The `Verify MSRV` job fails on every PR against `58_maintenance` (for 
example #11767 and #11763) for reasons unrelated to those PRs:
   
   ```
   error: cannot install package `cargo-msrv 0.19.5`, it requires rustc 1.94.1 
or newer, while the currently active rustc version is 1.91.1
   `cargo-msrv 0.19.3` supports rustc 1.91.1
   ```
   
   `cargo-msrv` 0.19.4 and 0.19.5 were released today (2026-10-21) and require 
rustc 1.94.1, but `58_maintenance` pins the toolchain to 1.91 in 
`rust-toolchain.toml`. `cargo install cargo-msrv --locked` does not help 
because `--locked` only pins the dependency graph, not the `cargo-msrv` version 
itself.
   
   # What changes are included in this PR?
   
   Install `cargo-msrv` using `taiki-e/install-action` (which downloads a 
prebuilt binary and does not need to compile anything with the pinned 
toolchain), the same way `main` does since #10589. The action is pinned to the 
same commit as on `main`.
   
   # Are these changes tested?
   
   CI
   
   # Are there any user-facing changes?
   
   No, CI only.


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