Update build-tools to 30.0.3

(cherry picked from commit 7621eb8d12f81478eb926b1037c636bf94ebd22d)

development/compiling/compiling_for_android.rst

@@ -61,7 +61,7 @@ Setting up the buildsystem
 
     ::
 
-        tools/bin/sdkmanager --sdk_root=<android_sdk_path> "platform-tools" "build-tools;30.0.1" "platforms;android-29" "cmdline-tools;latest" "cmake;3.10.2.4988404"
+        tools/bin/sdkmanager --sdk_root=<android_sdk_path> "platform-tools" "build-tools;30.0.3" "platforms;android-29" "cmdline-tools;latest" "cmake;3.10.2.4988404"
 
 .. seealso::   To set the environment variable on Windows, press :kbd:`Windows + R`, type 
             "control system", then click on **Advanced system settings** in the left

tutorials/export/exporting_for_android.rst

@@ -17,7 +17,7 @@ Download and install the Android SDK.
   - Ensure that the `required packages <https://developer.android.com/studio/intro/update#recommended>`__ are installed as well.
     
     - Android SDK Platform-Tools version 30.0.5 or later
-    - Android SDK Build-Tools version 30.0.1
+    - Android SDK Build-Tools version 30.0.3
     - Android SDK Platform 29
     - Android SDK Command-line Tools (latest)
     - CMake version 3.10.2.4988404
@@ -29,7 +29,7 @@ Download and install the Android SDK.
 
 ::
 
-    sdkmanager --sdk_root=<android_sdk_path> "platform-tools" "build-tools;30.0.1" "platforms;android-29" "cmdline-tools;latest" "cmake;3.10.2.4988404" "ndk;21.4.7075529"
+    sdkmanager --sdk_root=<android_sdk_path> "platform-tools" "build-tools;30.0.3" "platforms;android-29" "cmdline-tools;latest" "cmake;3.10.2.4988404" "ndk;21.4.7075529"
 
 .. note::