MINOR: [CI] Fix RC JNI builds on Windows (ArrowS3 link) and macOS (runner) (#1315)

## What's Changed

Fix the `RC` workflow JNI builds, which have been failing on `main`
since the Arrow C++ `main` checkout changed.

- **JNI Windows (`dataset/CMakeLists.txt`)**: Arrow C++ moved S3 into
its own library (apache/arrow GH-50194). `arrow_dataset_jni` still calls
`arrow::fs::EnsureS3Finalized()` but no longer linked the library
defining it, which failed with `LNK2019: unresolved external symbol`.
Link `ArrowS3::arrow_s3_static` when the `ArrowS3` package is found, so
builds against older Arrow C++ are unaffected.
- **JNI macOS (`.github/workflows/rc.yml`)**: switch the runner from
`macos-14` to `macos-15`. The Arrow C++ Brewfile installs `llvm`, which
has no Homebrew bottle for macOS 14, so `brew bundle` compiled LLVM from
source until the job hit the 1h timeout. `MACOSX_DEPLOYMENT_TARGET`
stays at `14.0`.

Author: jbonofre

.github/workflows/rc.yml

@@ -162,7 +162,7 @@ jobs:
       fail-fast: false
       matrix:
         platform:
-          - { runs_on: macos-14, arch: "aarch_64" }
+          - { runs_on: macos-15, arch: "aarch_64" }
     env:
       MACOSX_DEPLOYMENT_TARGET: "14.0"
     steps:

ci/scripts/jni_macos_build.sh

@@ -75,6 +75,7 @@ cmake \
   --preset=ninja-release-jni-macos \
   -Dabsl_SOURCE=BUNDLED \
   -Dsimdjson_SOURCE=BUNDLED \
+  -Duriparser_SOURCE=BUNDLED \
   -DCMAKE_INSTALL_PREFIX="${install_dir}"
 cmake --build "${build_dir}/cpp" --target install
 github_actions_group_end

dataset/CMakeLists.txt

@@ -17,6 +17,11 @@
 
 find_package(ArrowDataset REQUIRED)
 find_package(ArrowSubstrait REQUIRED)
+# S3 support lives in its own library since Arrow C++ 26.0.0 (apache/arrow GH-50194).
+# Older versions bundle it into libarrow and don't provide the ArrowS3 package.
+if(ARROW_VERSION VERSION_GREATER_EQUAL 26.0.0)
+  find_package(ArrowS3 REQUIRED)
+endif()
 
 include_directories(${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR}
                     ${JNI_INCLUDE_DIRS} ${JNI_HEADERS_DIR})
@@ -39,6 +44,9 @@ target_link_libraries(arrow_java_jni_dataset
                       jni
                       ArrowDataset::arrow_dataset_static
                       ArrowSubstrait::arrow_substrait_static)
+if(ArrowS3_FOUND)
+  target_link_libraries(arrow_java_jni_dataset ArrowS3::arrow_s3_static)
+endif()
 
 if(BUILD_TESTING)
   add_executable(arrow-java-jni-dataset-test src/main/cpp/jni_util_test.cc