Bump MSRV from 1.88.0 to 1.94.0 (#23632)

see previous bump

- #18403

honestly my main motivation was i was using a feature from `1.89.0`
apparently for #23631 and
realized we hadn't bumped this in a while

if we prefer to be more conservative with msrv bumps (i.e. only bump if
a dependency requires it or we see a really useful feature/lib function
in newer versions) then i'm fine with leaving it and altering my PR
above, but in the past we usually kept up to date with bumping our msrv

Author: Jefffrey

Cargo.toml

@@ -78,7 +78,7 @@ license = "Apache-2.0"
 readme = "README.md"
 repository = "https://github.com/apache/datafusion"
 # Define Minimum Supported Rust Version (MSRV)
-rust-version = "1.88.0"
+rust-version = "1.94.0"
 # Define DataFusion version
 version = "54.1.0"
 

docs/source/library-user-guide/upgrading/55.0.0.md

@@ -776,3 +776,9 @@ async fn plan_extension(
 ```
 
 See [PR #23649](https://github.com/apache/datafusion/pull/23649) for details.
+
+### `MSRV` updated to 1.94.0
+
+The Minimum Supported Rust Version (MSRV) has been updated to [`1.94.0`].
+
+[`1.94.0`]: https://releases.rs/docs/1.94.0/