ci: install cargo-ndk 2.12.7 specifically.

The MSRV of the 3.x release stream is v1.68+

Author: cpu

.github/workflows/ci.yml

@@ -42,7 +42,7 @@ jobs:
         if: matrix.os == 'ubuntu-latest'
         run: |
           rustup target add aarch64-linux-android
-          cargo install cargo-ndk
+          cargo install cargo-ndk --version 2.12.7
           cargo ndk -t arm64-v8a clippy-ci
 
       - name: Clippy (iOS)
@@ -103,7 +103,7 @@ jobs:
           working-directory: ./android
           script: |
             rustup target add x86_64-linux-android
-            cargo install cargo-ndk
+            cargo install cargo-ndk --version 2.12.7
             env | grep '^JAVA'
             touch emulator.log
             chmod 770 emulator.log