Update Android SDK Platform Version in CI Workflow

This commit updates the Android SDK Platform version in the
`build-credential-manager.yml` workflow from
`android-VanillaIceCream` to `android-34`.

- Updated the `Install Android SDK Platform VanillaIceCream` step
  to use `android-34` instead of `android-VanillaIceCream`.

Author: cartland

.github/workflows/build-credential-manager.yml

@@ -27,7 +27,7 @@ jobs:
       - name: Install Android SDK Platform VanillaIceCream
         run: |
           echo "y" | $ANDROID_SDK_ROOT/cmdline-tools/latest/bin/sdkmanager --licenses > /dev/null
-          echo "y" | $ANDROID_SDK_ROOT/cmdline-tools/latest/bin/sdkmanager "platforms;android-VanillaIceCream"
+          echo "y" | $ANDROID_SDK_ROOT/cmdline-tools/latest/bin/sdkmanager "platforms;android-34"
 
       # The sample includes a keystore.properties.template.
       # For a CI build, we might need to provide a dummy or generated keystore.