fix: properly expand ORIGINAL_VERSION variable in protobuf script

Author: trask

.github/unsafe/build-custom-protobuf.sh

@@ -46,6 +46,6 @@ DEPS="${SCRIPT_DIR}/../../dependencyManagement/build.gradle.kts"
 sed -i '/com\.google\.protobuf:protobuf-bom:/d' "${DEPS}"
 sed -i '/com\.google\.protobuf:protobuf-java/d' "${DEPS}"
 sed -i '/^val DEPENDENCIES = listOf(/a\  "com.google.protobuf:protobuf-java:'"${CUSTOM_VERSION}"'",' "${DEPS}"
-sed -i '/^val DEPENDENCIES = listOf(/a\  "com.google.protobuf:protobuf-java-util:${ORIGINAL_VERSION}",' "${DEPS}"
+sed -i '/^val DEPENDENCIES = listOf(/a\  "com.google.protobuf:protobuf-java-util:'"${ORIGINAL_VERSION}"'",' "${DEPS}"
 
 echo "protobuf-java ${CUSTOM_VERSION} built and installed (UNSAFE disabled)."