Build fails against DataFusion 54.1.0 due to new `schema` field on `RecursiveQuery`

[andygrove]

Describe the bug

datafusion-python does not build against DataFusion 54.1.0. The workspace
dependencies are declared as version = "54", so Cargo is free to resolve them
to 54.1.0, but the crate no longer compiles when it does:

error[E0063]: missing field `schema` in initializer of `datafusion::logical_expr::RecursiveQuery`
  --> crates/core/src/expr/recursive_query.rs:72:20
   |
72 |             query: RecursiveQuery {
   |                    ^^^^^^^^^^^^^^ missing `schema`

DataFusion 54.1.0 added a schema: DFSchemaRef field to
datafusion_expr::logical_plan::RecursiveQuery and introduced
RecursiveQuery::try_new(), which computes that schema by reconciling the
static and recursive terms. Our PyRecursiveQuery::new() builds the struct
with a literal initializer, so the new field breaks it.

To Reproduce

With a Cargo.lock that resolves DataFusion to 54.1.0 (e.g. a fresh checkout
without the committed lock file, or after cargo update -p datafusion --precise 54.1.0):

cargo check --workspace --all-targets

Expected behavior

datafusion-python builds and tests against DataFusion 54.1.0.

Additional context

Because the existing version requirements are "54", this is not limited to
developers who explicitly opt in — any consumer resolving the dependency fresh
picks up 54.1.0 and hits the failure. The fix is to use
RecursiveQuery::try_new() and pin the workspace requirements to "54.1".