CI: Android target API level 23

API Level 23 (Android 6) is the recommended target and often used
by other projects, like React Native.  There are a lot of custom
Android platforms that may be stuck on old versions so we want to
make sure we support such old versions still.

Authored-By: Brad House (@bradh352)

.github/workflows/android.yml

@@ -10,7 +10,7 @@ concurrency:
   cancel-in-progress: true
 
 env:
-  CMAKE_DEFAULT_FLAGS: "-DCMAKE_BUILD_TYPE=DEBUG -DCARES_STATIC=ON -DCARES_STATIC_PIC=ON -G Ninja -DANDROID_PLATFORM=android-26"
+  CMAKE_DEFAULT_FLAGS: "-DCMAKE_BUILD_TYPE=DEBUG -DCARES_STATIC=ON -DCARES_STATIC_PIC=ON -G Ninja -DANDROID_PLATFORM=android-23"
   MAKE: make
 
 jobs:
@@ -60,11 +60,11 @@ jobs:
           BUILD_TYPE: autotools
           TOOLCHAIN: "${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64"
           TARGET: aarch64-linux-android
-          API: 26
+          API: 23
           AR: "${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-ar"
-          CC: "${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64/bin/clang --target=aarch64-linux-android26"
-          AS: "${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64/bin/clang --target=aarch64-linux-android26"
-          CXX: "${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ --target=aarch64-linux-android26"
+          CC: "${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64/bin/clang --target=aarch64-linux-android23"
+          AS: "${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64/bin/clang --target=aarch64-linux-android23"
+          CXX: "${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ --target=aarch64-linux-android23"
           LD: "${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64/bin/ld"
           RANLIB: "${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-ranlib"
           STRIP: "${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-strip"