Increase minimum supported Rust version (MSRV) to 1.80.1

We currently require 1.80, but we also say that

> If a hotfix is released for the minimum supported Rust version (MSRV),
> the MSRV will be the minor version with all hotfixes

therefore we should requite 1.80.1 and thus allow dependencies that
require 1.80.1 (such as substrait)

Author: findepi

Cargo.toml

@@ -65,7 +65,7 @@ homepage = "https://datafusion.apache.org"
 license = "Apache-2.0"
 readme = "README.md"
 repository = "https://github.com/apache/datafusion"
-rust-version = "1.80"
+rust-version = "1.80.1"
 version = "43.0.0"
 
 [workspace.dependencies]