ci: align the runner list with the main repository

Use the same runner list as the main repository ones. Originally I meant
to just add macos-14 so we cover macOS ARM, which is nice because it
runs on qemu-m0 from the brew package, but at this point let's also use
explicit version for the other runners too.

Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>

Author: fabiobaltieri

.github/workflows/build.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [ubuntu-22.04, macos-12, macos-14, windows-2022]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout