chore: Update showcase scripts to use TEST_CURRENT_YEAR=2025

Author: blakeli0

java-showcase/scripts/generate_showcase.sh

@@ -8,6 +8,7 @@ trap cleanup ERR
 readonly ROOT_DIR="$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )/../.."
 pushd "${ROOT_DIR}"
 source "${ROOT_DIR}/java-showcase/scripts/showcase_utilities.sh"
+export TEST_CURRENT_YEAR=2025
 
 cleanup() {
   if [[ -z "${api_def_dir}" ]]; then