Run CI on Ubuntu 24.04

ubuntu-latest is now Ubuntu 26.04. Swift 6.3 has no toolchain for it, and the nightly-main toolchain needs binutils-gold, so every job failed while installing the toolchain.

Author: niktishakov

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
       matrix:
         swift_version: ['6.3', 'nightly-6.3', 'nightly-main']
         ndk_version: ['r27d', 'r29', 'r30']
-        os: ['ubuntu-latest']
+        os: ['ubuntu-24.04']
         configuration: ['Debug', 'Release']
     runs-on: ${{ matrix.os }}
     env: