chore(deps): upgrade Lance to v15.0.0-beta.18 (#4965)

Upgrade the Rust Lance dependency, Java lance-core, and Python test
dependency from beta.17 to the officially published
[v15.0.0-beta.18](https://github.com/lance-format/lance/releases/tag/v15.0.0-beta.18)
(`079fd77683a7acf056b0912f6ecda938e39ee120`). This provides a compatible
SDK for the newer Lance source already adopted downstream. Rust registry
versions and checksums are unchanged; the Python lock uses the six
published beta.18 wheels.

### Compatibility

The adopted release includes [Lance
#10863](https://github.com/lance-format/lance/pull/10863):
`FilteredReadOptionsProto.has_fragment_ids` distinguishes an explicit
empty fragment selection. Older executors ignore this field, so upgrade
executors before relying on the corrected empty-selection behavior. Rust
callers constructing this generated struct need the new field. [Lance
#10112](https://github.com/lance-format/lance/pull/10112) also replaces
the internal `hamming_distance_batch` API with
`hamming_distance_batch_into`.

The Linux Python matrix timeout is raised from 30 to 60 minutes: the
Python 3.13 cold native build and both test passes completed, but the
job hit its limit during cleanup. Build profiles, test commands, and
coverage are unchanged.

### Validation

- Three native FRI/ANN regressions passed: deferred-compaction refined
RQ, deferred index remapping, and approximate-query builder.
- `cargo clippy --quiet --locked --features remote --tests --examples --
-D warnings` passed with pinned Rust 1.97.0.
- Locked metadata, formatting, Python Makefile-scope Ruff checks, and
`uv lock --check --offline` passed.
- YAML, whitespace, end-of-file, and typo checks passed for the
timeout-only workflow change.

### Publication and CI

Java beta.18 is now published. After [Lance
#10968](https://github.com/lance-format/lance/pull/10968) merged, the
[normal publication
workflow](https://github.com/lance-format/lance/actions/runs/43146352505)
built all three JNI targets and published successfully; the Maven jar is
available. The upstream Python publication run was cancelled after its
Windows ARM job hit the one-hour timeout; six other wheels were
published and are the actual artifacts recorded in this lock.
Cross-platform SDK CI is still required. No performance claim is made by
this dependency update.

java/pom.xml

@@ -28,7 +28,7 @@
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <arrow.version>15.0.0</arrow.version>
-        <lance-core.version>15.0.0-beta.17</lance-core.version>
+        <lance-core.version>15.0.0-beta.18</lance-core.version>
         <jackson.version>2.18.12</jackson.version>
         <spotless.skip>false</spotless.skip>
         <spotless.version>2.30.0</spotless.version>