[libc] Update clang to v22 in the fullbuild tests

The apt repository has been updated so installing version 22 actually
works now.

Fixes #151215.

Author: boomanaiden154

.github/workflows/libc-fullbuild-tests.yml

@@ -21,36 +21,36 @@ jobs:
           - os: ubuntu-24.04
             build_type: Debug
             ccache-variant: sccache
-            c_compiler: clang-20
+            c_compiler: clang-22
             cpp_compiler: clang++-20
             target: x86_64-unknown-linux-llvm
             include_scudo: ON
           - os: ubuntu-24.04
             build_type: Release
             ccache-variant: sccache
-            c_compiler: clang-20
+            c_compiler: clang-22
             cpp_compiler: clang++-20
             target: x86_64-unknown-linux-llvm
             include_scudo: ON
           - os: ubuntu-24.04
             build_type: MinSizeRel
             ccache-variant: sccache
-            c_compiler: clang-20
+            c_compiler: clang-22
             cpp_compiler: clang++-20
             target: x86_64-unknown-linux-llvm
             include_scudo: ON
           # TODO: remove ccache logic when https://github.com/hendrikmuhs/ccache-action/issues/279 is resolved.
           - os: ubuntu-24.04-arm
             build_type: Debug
             ccache-variant: ccache
-            c_compiler: clang-20
+            c_compiler: clang-22
             cpp_compiler: clang++-20
             target: aarch64-unknown-linux-llvm
             include_scudo: ON
           - os: ubuntu-24.04
             build_type: Debug
             ccache-variant: ccache
-            c_compiler: clang-20
+            c_compiler: clang-22
             cpp_compiler: clang++-20
             target: x86_64-unknown-uefi-llvm
             include_scudo: OFF