MINOR: fix incorrect GC log size with JDK9+ (#8800)

Author: Xavier Léauté <xavier@confluent.io>

Reviewers: Ismael Juma <ismael@juma.me.uk>, Chia-Ping Tsai <chia7712@gmail.com>, Manikumar Reddy <manikumar.reddy@gmail.com>

bin/kafka-run-class.sh

@@ -297,7 +297,7 @@ if [ "x$GC_LOG_ENABLED" = "xtrue" ]; then
   # We need to match to the end of the line to prevent sed from printing the characters that do not match
   JAVA_MAJOR_VERSION=$("$JAVA" -version 2>&1 | sed -E -n 's/.* version "([0-9]*).*$/\1/p')
   if [[ "$JAVA_MAJOR_VERSION" -ge "9" ]] ; then
-    KAFKA_GC_LOG_OPTS="-Xlog:gc*:file=$LOG_DIR/$GC_LOG_FILE_NAME:time,tags:filecount=10,filesize=102400"
+    KAFKA_GC_LOG_OPTS="-Xlog:gc*:file=$LOG_DIR/$GC_LOG_FILE_NAME:time,tags:filecount=10,filesize=100M"
   else
     KAFKA_GC_LOG_OPTS="-Xloggc:$LOG_DIR/$GC_LOG_FILE_NAME -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCTimeStamps -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=100M"
   fi