revert to 22.04 for now

Author: wtdcode

.github/workflows/build-uc2.yml

@@ -471,7 +471,7 @@ jobs:
             generators: 'Ninja'
           }
           - {
-            os: ubuntu-latest,
+            os: ubuntu-22.04,
             arch: aarch64,
             python-arch: aarch64,
             python-ver: '3.8',
@@ -482,7 +482,7 @@ jobs:
             distro: ubuntu22.04
           }
           - {
-            os: ubuntu-latest,
+            os: ubuntu-22.04,
             arch: ppc64le,
             python-arch: ppc,
             python-ver: '3.8',