MINOR: Fix macOS JNI build (apache#689)

## What's Changed

Update a sanity check in CI that's incorrectly failing the macOS JNI
builds.

Recent LLVM uses Z3.

Author: lidavidm

ci/scripts/jni_macos_build.sh

@@ -153,6 +153,7 @@ archery linking check-dependencies \
   --allow libncurses \
   --allow libobjc \
   --allow libz \
+  --allow libz3 \
   "arrow_cdata_jni/${normalized_arch}/libarrow_cdata_jni.dylib" \
   "arrow_dataset_jni/${normalized_arch}/libarrow_dataset_jni.dylib" \
   "arrow_orc_jni/${normalized_arch}/libarrow_orc_jni.dylib" \