fix: RELEASING/Dockerfile.make_docs 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-APT-1541449
- https://snyk.io/vuln/SNYK-DEBIAN12-KRB5-6277412
- https://snyk.io/vuln/SNYK-DEBIAN12-KRB5-6277421
- https://snyk.io/vuln/SNYK-DEBIAN12-LIBGCRYPT20-1550206

RELEASING/Dockerfile.make_docs

@@ -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:3.14.0a3-slim-bookworm
 ARG VERSION
 
 RUN git clone --depth 1 --branch ${VERSION} https://github.com/apache/superset.git /superset