Updated Maven version

private-rows-extension/Dockerfile-build-env

 FROM gradle:6-jdk8
-RUN apt-get update && apt install -y openjdk-17-jdk maven
+RUN apt-get update && apt install -y openjdk-17-jdk
+
+# Installing the latest Maven version manually
+# (the one provided by apt is not compatible with Java 17 and we need Java 14+)
+
+RUN wget https://dlcdn.apache.org/maven/maven-3/3.8.4/binaries/apache-maven-3.8.4-bin.tar.gz && \
+    mkdir -p /usr/local/apache-maven && \
+    mv apache-maven-3.8.4-bin.tar.gz /usr/local/apache-maven && \
+    cd /usr/local/apache-maven && \
+    tar -xzvf apache-maven-3.8.4-bin.tar.gz
+    
+RUN export M2_HOME=/usr/local/apache-maven/apache-maven-3.8.4
+RUN export M2=$M2_HOME/bin
+RUN export PATH=$M2:$PATH