Refresh bazel environment setup instructions.

And use android-36 SDK consistently.

PiperOrigin-RevId: 856263943

Author: brettchabot

CONTRIBUTING.md

@@ -33,14 +33,14 @@ Currently only Linux is fully supported. Mac may work but is not regularly teste
     on PATH.
 *   Install the [Android SDK](https://developer.android.com/studio/install) and
     run the following command to ensure you have the necessary components:
-    `cmdline-tools/latest/bin/sdkmanager  "build-tools;33.0.2"`
-    `cmdline-tools/latest/bin/sdkmanager "platforms;android-35" "build-tools;35.0.0"`
+    `cmdline-tools/latest/bin/sdkmanager  "build-tools;36.0.0" "platforms;android-36"`
 *   Set the `ANDROID_HOME` environment variable to point to the SDK install
     location. For example
     *   On Linux: `export ANDROID_HOME=/home/$USER/Android/Sdk`
     *   On Mac: `export ANDROID_HOME=/Users/$USER/Library/Android/sdk`
     You can also add this command to your ~/.bashrc, ~/.zshrc, or ~/.profile file to make it
     permanent.
+*.  Install Zulu Java 21 and add to PATH
 
 ### IDE setup
 

opensource/BUILD

@@ -5,7 +5,7 @@ load("@build_bazel_rules_android//android:rules.bzl", "android_library")
 java_import(
     name = "androidsdk_compiletime",
     jars = [
-        "@androidsdk//:platforms/android-35/android.jar",
+        "@androidsdk//:platforms/android-36/android.jar",
     ],
     neverlink = 1,
     visibility = [