CI: Install the latest (currently) version of the LTS NDK.

mk/cargo.sh

@@ -26,7 +26,8 @@ qemu_mipsel="qemu-mipsel -L /usr/mipsel-linux-gnu"
 # directory like `clang` that would conflict with the same-named tools that may
 # be needed to compile the build script, or to compile for other targets.
 if [ -n "${ANDROID_HOME-}" ]; then
-  ndk_version=25.1.8937393
+  # Keep the next line in sync with the corresponding line in install-build-tools.sh.
+  ndk_version=25.2.9519653
   ANDROID_NDK_ROOT=${ANDROID_NDK_ROOT:-${ANDROID_HOME}/ndk/$ndk_version}
 fi
 if [ -n "${ANDROID_NDK_ROOT-}" ]; then

mk/install-build-tools.sh

@@ -27,8 +27,22 @@ function install_packages {
 use_clang=
 case $target in
 --target*android*)
+  # https://blog.rust-lang.org/2023/01/09/android-ndk-update-r25.html says
+  # "Going forward the Android platform will target the most recent LTS NDK,
+  # allowing Rust developers to access platform features sooner. These updates
+  # should occur yearly and will be announced in release notes." Assume that
+  # means that we should always prefer to be using the latest 25.x.y version of
+  # the NDK until the Rust project announces that we should use a higher major
+  # version number.
+  #
+  # TODO: This should probably be implemented as a map of Rust toolchain version
+  # to NDK version; e.g. our MSRV might (only) support an older NDK than the
+  # latest stable Rust toolchain.
+  #
+  # Keep the following line in sync with the corresponding line in cargo.sh.
+  ndk_version=25.2.9519653
+
   mkdir -p "${ANDROID_HOME}/licenses"
-  ndk_version=25.1.8937393
   android_license_file="${ANDROID_HOME}/licenses/android-sdk-license"
   accept_android_license=24333f8a63b6825ea9c5514f83c2829b004d1fee
   grep --quiet --no-messages "$accept_android_license" "$android_license_file" \