ci: Test armv7hf Linux on ubuntu-24.04-arm runner

https://github.com/taiki-e/setup-cross-toolchain-action/releases/tag/v1.27.0

Author: taiki-e

.github/workflows/ci.yml

@@ -41,7 +41,7 @@ jobs:
           - os: macos-latest
           - os: windows-latest
           - os: ubuntu-24.04-arm
-          - os: ubuntu-latest
+          - os: ubuntu-24.04-arm
             target: armv7-unknown-linux-gnueabihf
           - os: ubuntu-latest
             target: armv5te-unknown-linux-gnueabi