checkstyle: fix broken build

Author: xingyaner

projects/checkstyle/Dockerfile

@@ -19,6 +19,6 @@ RUN curl -L https://archive.apache.org/dist/maven/maven-3/3.6.3/binaries/apache-
   unzip maven.zip -d $SRC/maven && \
   rm maven.zip
 ENV MVN $SRC/maven/apache-maven-3.6.3/bin/mvn
-RUN git clone --depth 1 https://github.com/checkstyle/checkstyle checkstyle
+RUN git clone --depth 1 --branch checkstyle-10.17.0 https://github.com/checkstyle/checkstyle checkstyle
 COPY *.sh *Fuzzer.java $SRC/
 WORKDIR $SRC/checkstyle

projects/checkstyle/build.sh

@@ -16,7 +16,7 @@
 ##########################################################################
 export TARGET_PACKAGE_PREFIX="com.puppycrawl.tools.checkstyle."
 
-MAVEN_ARGS="-Dmaven.test.skip=true -Djavac.src.version=15 -Djavac.target.version=15 --update-snapshots"
+MAVEN_ARGS="-Dmaven.test.skip=true -Djavac.src.version=17 -Djavac.target.version=17 --update-snapshots"
 $MVN clean package $MAVEN_ARGS
 
 BUILD_CLASSPATH=