chore: [maven-agent] Bump maven version in dockerfiles/maven/Dockerfile (#2165)

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dockerfiles/maven/Dockerfile

@@ -5,7 +5,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates
   rm -rf /var/lib/apt/lists/*
 
 # Now time to install maven
-ARG MAVEN_VERSION=3.9.14
+ARG MAVEN_VERSION=3.9.15
 
 # Set SHELL flags for RUN commands to allow -e and pipefail
 # Rationale:https://github.com/hadolint/hadolint/wiki/DL4006