Switch master/stable-3.11 to use java 21

Change-Id: I6ccb94faab810b48c9bad02432fc0b289c047ae9

jenkins-docker/agent-debian/set-java.sh

diff --git a/jenkins-docker/agent-debian/set-java.sh b/jenkins-docker/agent-debian/set-java.sh
index 8a9cc52..f50e7e3 100755
--- a/jenkins-docker/agent-debian/set-java.sh
+++ b/jenkins-docker/agent-debian/set-java.sh
@@ -8,8 +8,8 @@
   echo "Example: $0 17"
   echo "         Java set to: /usr/lib/jvm/java-17-openjdk-amd64/bin/java"
   echo "Providing --branch automatically selects the java version"
-  echo "Example: $0 --branch stable-3.10"
-  echo "         Java set to: /usr/lib/jvm/java-17-openjdk-amd64/bin/java"
+  echo "Example: $0 --branch stable-3.11"
+  echo "         Java set to: /usr/lib/jvm/java-21-openjdk-amd64/bin/java"
   exit 1
 fi
 
@@ -17,7 +17,11 @@
 then
   shift
   case "$1" in
-    master|stable-3.9|stable-3.10|stable-3.11)
+    master|stable-3.11)
+      JAVA_VERSION=21
+      ;;
+
+    stable-3.9|stable-3.10)
       JAVA_VERSION=17
       ;;
 
@@ -38,9 +42,10 @@
 
 echo "Java set to: $(which java)"
 
-if [ "$JAVA_VERSION" == "11" ] || [ "$JAVA_VERSION" == "17" ]
+if [ "$JAVA_VERSION" == "11" ] || [ "$JAVA_VERSION" == "17" ] || \
+    [ "$JAVA_VERSION" == "21" ]
 then
-   # See Bazel Issue 3236 with Java 11/17 [https://github.com/bazelbuild/bazel/issues/3236]
-   export BAZEL_OPTS="$BAZEL_OPTS --sandbox_tmpfs_path=/tmp"
+  # See Bazel Issue 3236 with Java 11/17/21 [https://github.com/bazelbuild/bazel/issues/3236]
+  export BAZEL_OPTS="$BAZEL_OPTS --sandbox_tmpfs_path=/tmp"
 fi