WIP: github: Try switching to 24.04

Author: mstorsjo

.github/workflows/build.yml

@@ -172,7 +172,7 @@ jobs:
   # Crosscompile the toolchain for running on Linux on a different architecture, bundle the runtime
   # libraries that were built in the 'linux-stage1' step above.
   linux-cross-riscv64:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v4
       - name: Unpack stage1 Clang