Use Java11 even while installing the SDK

If not, even the install fails with

```
BEGIN: About to start android SDK download
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: com/android/prefs/AndroidLocationsProvider has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:473)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
	at java.lang.Class.getDeclaredMethods0(Native Method)
	at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
```

.github/workflows/android-automated-sdk-install.yml

@@ -40,13 +40,15 @@ jobs:
 
     - name: Install to a new SDK root
       run: |
+        export JAVA_HOME=$JAVA_HOME_11_X64
         export ANDROID_SDK_ROOT=$NEW_ANDROID_SDK_ROOT
         echo "New SDK root $ANDROID_SDK_ROOT"
         printf "Y\nY\nY\nY\nY\n" | bash setup/prereq_android_sdk_install.sh
 
     - name: Verify that all packages are as expected
       shell: bash -l {0}
       run: |
+        export JAVA_HOME=$JAVA_HOME_11_X64
         echo "Comparing $ANDROID_SDK_ROOT and $NEW_ANDROID_SDK_ROOT"
         $ANDROID_SDK_ROOT/cmdline-tools/latest/bin/sdkmanager --list_installed > /tmp/existing_packages
         $NEW_ANDROID_SDK_ROOT/cmdline-tools/latest/bin/sdkmanager --list_installed > /tmp/new_packages
@@ -56,6 +58,7 @@ jobs:
     - name: Verify that directory structure is consistent
       shell: bash -l -x {0}
       run: |
+        export JAVA_HOME=$JAVA_HOME_11_X64
         export ANDROID_SDK_ROOT=$NEW_ANDROID_SDK_ROOT
         echo "New SDK root $ANDROID_SDK_ROOT"
         ls -al $ANDROID_SDK_ROOT