[GITHUB] Stick to ubuntu-22.04 for build-linux

Fixes clang build, since ubuntu-latest (24.04.1 LTS / Noble Numbat) has no
LLVM 13 package available:

```
Ign:6 https://apt.llvm.org/noble llvm-toolchain-noble-13 InRelease
Err:9 https://apt.llvm.org/noble llvm-toolchain-noble-13 Release
  404  Not Found [IP: 151.101.46.49 443]
Reading package lists...
E: The repository 'http://apt.llvm.org/noble llvm-toolchain-noble-13 Release' does not have a Release file.
Error: Process completed with exit code 100.
```

.github/workflows/build.yml

@@ -15,7 +15,7 @@ jobs:
           - dllver: 0x600
             config: Release
       fail-fast: false
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
     - name: Get RosBE build specifics
       id: get_rosbe_spec