revert: restore the lance v12.0.0-beta.5 pin on main (#4095)

Reverts #4093 (`c4ee8ae`), restoring main's lance dependency to
v12.0.0-beta.5 and the v12 integration surface it carried — the
`read_dir_page` paginated-listing pushdown from #3979, the v12
object-store wrapper APIs, and the shard-manifest call sites.

Pinning lance v11.0.0 stable belonged on a dedicated release branch for
cutting v0.38.0, not on main: main was already on the v12 beta train, so
#4093 was a downgrade of the development line. The released **v0.38.0
stands as published** — this only moves main forward again.

Verified on this branch: `cargo check --features remote --tests
--examples` clean, all 48 `database::listing` tests pass (the restored
store-pushdown pagination versions), `cargo fmt --check` and `cargo
clippy --features remote --tests --examples` clean. The root
`Cargo.lock` is restored by the revert and resolves as-is.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

https://claude.ai/code/session_01BX7w9fUMQbPAXuxe9YgQKc

---
_Generated by [Claude
Code](https://claude.ai/code/session_01BX7w9fUMQbPAXuxe9YgQKc)_

Co-authored-by: Claude <noreply@anthropic.com>

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>11.0.0</lance-core.version>
+        <lance-core.version>12.0.0-beta.5</lance-core.version>
         <spotless.skip>false</spotless.skip>
         <spotless.version>2.30.0</spotless.version>
         <spotless.java.googlejavaformat.version>1.7</spotless.java.googlejavaformat.version>