Fixing release script

Author: donmccasland

scripts/release.sh

@@ -3,8 +3,6 @@ set -euo pipefail
 export KOKORO_GITHUB_DIR=${KOKORO_ROOT}/src/github
 source ${KOKORO_GFILE_DIR}/kokoro/common.sh
 
-source "${KOKORO_PIPER_DIR}/google3/third_party/runtimes_common/kokoro/common.sh"
-
 cd ${KOKORO_GITHUB_DIR}/python-runtime
 
 if [ -z "${TAG:+set}" ]; then