Upgrade to datafusion 49 (#118)

* Upgrade to datafusion 49

* Bump rust version to 1.85.1

Bump rust version to 1.85.1 because this is needed by datafusion 49.

Author: mjgarton

.github/workflows/ci.yml

@@ -81,6 +81,6 @@ jobs:
     - uses: actions/checkout@v4
     - uses: actions-rs/toolchain@v1
       with:
-        toolchain: "1.85.0"
+        toolchain: "1.85.1"
         override: true
     - run: cargo build --all-features