ci: Test AArch64 Windows (#7288)

Author: taiki-e

.github/workflows/ci.yml

@@ -554,6 +554,8 @@ jobs:
           - target: aarch64-unknown-linux-gnu
             os: ubuntu-22.04-arm # TODO: update to 24.04 when https://github.com/rust-lang/rust/issues/135867 solved
             rustflags: --cfg tokio_taskdump
+          - target: aarch64-pc-windows-msvc
+            os: windows-11-arm
     steps:
       - uses: actions/checkout@v4
       - name: Install Rust stable
@@ -598,6 +600,8 @@ jobs:
           - target: aarch64-unknown-linux-gnu
             os: ubuntu-22.04-arm # TODO: update to 24.04 when https://github.com/rust-lang/rust/issues/135867 solved
             rustflags: --cfg tokio_taskdump
+          - target: aarch64-pc-windows-msvc
+            os: windows-11-arm
     steps:
       - uses: actions/checkout@v4
       - name: Install Rust stable