use GrapheneOS microdroid kernels

static/releases.html

@@ -546,6 +546,7 @@ <h3><a href="#2024102100">2024102100</a></h3>
                         <li>raise backup service transport (Seedvault) from 10 minutes / 5 minutes to 60 minutes / 30 minutes</li>
                         <li>temporarily revert enforcing minimum 64kiB stack guard size for arm64 since Facebook recently included a buggy stack overflow check for the React Native Hermes runtime that's incompatible with larger gap sizes and beginning to be shipped by apps (revert was not applied for Android 15 port)</li>
                         <li>kernel (6.1): update to latest GKI LTS branch revision</li>
+                        <li>use hardened GrapheneOS 6.6 LTS kernel for microdroid virtual machines for both arm64 and x86_64</li>
                         <li>Vanadium: update to <a href="https://github.com/GrapheneOS/Vanadium/releases/tag/130.0.6723.73.0">version 130.0.6723.73.0</a></li>
                         <li>GmsCompatConfig: update to <a href="https://github.com/GrapheneOS/platform_packages_apps_GmsCompat/releases/tag/config-144">version 144</a></li>
                         <li>GmsCompatConfig: update to <a href="https://github.com/GrapheneOS/platform_packages_apps_GmsCompat/releases/tag/config-145">version 145</a></li>