deps: update docker.io/library/python docker tag to v3.13.7

Author: renovate-bot

.cloudbuild/library_generation/library_generation.Dockerfile

@@ -34,7 +34,7 @@ RUN mvn install -B -ntp -DskipTests -Dclirr.skip -Dcheckstyle.skip
 RUN cp "/root/.m2/repository/com/google/api/gapic-generator-java/${DOCKER_GAPIC_GENERATOR_VERSION}/gapic-generator-java-${DOCKER_GAPIC_GENERATOR_VERSION}.jar" \
   "./gapic-generator-java.jar"
 
-FROM docker.io/library/python:3.13.2-slim@sha256:6b3223eb4d93718828223966ad316909c39813dee3ee9395204940500792b740 as final
+FROM docker.io/library/python:3.13.7-slim@sha256:58c30f5bfaa718b5803a53393190b9c68bd517c44c6c94c1b6c8c172bcfad040 as final
 
 ARG OWLBOT_CLI_COMMITTISH=3a68a9c0de318784b3aefadcc502a6521b3f1bc5
 ARG PROTOC_VERSION=25.8