fix: src/recommendationservice/Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN11-ZLIB-6008961
- https://snyk.io/vuln/SNYK-DEBIAN11-DB53-2825168
- https://snyk.io/vuln/SNYK-DEBIAN11-GLIBC-521063
- https://snyk.io/vuln/SNYK-DEBIAN11-GLIBC-521063
- https://snyk.io/vuln/SNYK-DEBIAN11-TAR-523480

src/recommendationservice/Dockerfile

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM python:3.10-slim-bullseye as base
+FROM python:3.12.7-slim-bullseye as base
 
 #
 # Fetch requirements