fix: RELEASING/Dockerfile.make_tarball to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN12-ZLIB-6008963
- https://snyk.io/vuln/SNYK-DEBIAN12-GLIBC-1547135
- https://snyk.io/vuln/SNYK-DEBIAN12-GLIBC-1547196
- https://snyk.io/vuln/SNYK-DEBIAN12-SHADOW-8551160
- https://snyk.io/vuln/SNYK-DEBIAN12-SHADOW-8551160

RELEASING/Dockerfile.make_tarball

@@ -14,7 +14,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-FROM python:3.10-slim-bookworm
+FROM python:3.14.0a1-slim-bookworm
 
 RUN apt-get update -y
 RUN apt-get install -y \