Bump Android MinSDK to 28 (Android 9.0)

.github/workflows/build_cmake.yml

@@ -462,7 +462,6 @@ jobs:
             -D "QT_HOST_PATH=$(readlink -f $Qt6_DIR/../gcc_64)" \
             -D "QT_ANDROID_SDK_BUILD_TOOLS_REVISION=30.0.3" \
             -D "QT_ANDROID_TARGET_SDK_VERSION=34" \
-            -D "QT_ANDROID_MIN_SDK_VERSION=26" \
             -D "QT_ANDROID_BUILD_ALL_ABIS=TRUE" \
             -D "ANDROID_NDK_ROOT=${ANDROID_SDK_ROOT}/ndk/${{ matrix.config.android_ndk }}" \
             -D "ANDROID_SDK_ROOT=${ANDROID_SDK_ROOT}" \

CMakeLists.txt

@@ -415,6 +415,7 @@ if (ANDROID)
         QT_ANDROID_PACKAGE_SOURCE_DIR "${CMAKE_SOURCE_DIR}/android"
         QT_ANDROID_VERSION_CODE ${VERSION_CODE}
         QT_ANDROID_VERSION_NAME ${VERSION}
+        QT_ANDROID_MIN_SDK_VERSION 28 # starting with 6.8 this shouldn't be needed anymore
     )
 
     if (QT_ANDROID_SDK_BUILD_TOOLS_REVISION) # this has to be set as a target property to stick