upgrade to openjdk 16, update cacerts

Dockerfile

@@ -1,5 +1,5 @@
-FROM openjdk:15.0.2-jdk-slim-buster
+FROM openjdk:16-jdk-slim-buster
 
-RUN ln -s /usr/local/openjdk-15 /docker-java-home
+RUN ln -s /usr/local/openjdk-16 /docker-java-home
 
-COPY cacerts /usr/local/openjdk-15/lib/security/
+COPY cacerts /usr/local/openjdk-16/lib/security/

Dockerfile.server

@@ -1,24 +1,24 @@
-FROM openjdk:15.0.2-jdk-slim-buster as builder
+FROM openjdk:16-jdk-slim-buster as builder
 
-RUN /usr/local/openjdk-15/bin/jlink \
+RUN /usr/local/openjdk-16/bin/jlink \
   --no-header-files \
   --no-man-pages \
   --add-modules java.base,java.prefs,java.naming,java.management,java.logging,java.sql,java.xml,java.compiler,java.instrument,java.desktop,jdk.management,jdk.crypto.cryptoki,jdk.crypto.ec,jdk.localedata,jdk.naming.dns,jdk.unsupported \
   --include-locales en-US,zh-CN,ru-RU,fr-FR,es-ES,en-GB,de-DE,pt-BR,en-CA,es-MX,it-IT,ja-JP \
   --compress 2 \
-  --output /usr/local/openjdk-15-slim
+  --output /usr/local/openjdk-16-slim
 
-COPY cacerts /usr/local/openjdk-15-slim/lib/security/
+COPY cacerts /usr/local/openjdk-16-slim/lib/security/
 
 FROM debian:buster-slim
 
-ENV JAVA_HOME /usr/local/openjdk-15
+ENV JAVA_HOME /usr/local/openjdk-16
 ENV PATH $JAVA_HOME/bin:$PATH
 ENV LANG C.UTF-8
-ENV JAVA_VERSION 15.0.2
+ENV JAVA_VERSION 16.0.0
 
-COPY --from=builder /usr/local/openjdk-15-slim /usr/local/openjdk-15
+COPY --from=builder /usr/local/openjdk-16-slim /usr/local/openjdk-16
 
-RUN ln -s /usr/local/openjdk-15 /docker-java-home
+RUN ln -s /usr/local/openjdk-16 /docker-java-home
 
 CMD ["java", "--version"]