Update dependency llvm to v22.1.6 (#549)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/actions/hardened-libc++/action.yaml

@@ -18,7 +18,7 @@ runs:
 
       env:
         # renovate: datasource=github-releases depName=llvm packageName=llvm/llvm-project extractVersion=^llvmorg-(?<version>.*)$
-        LLVM_VERSION: 22.1.5
+        LLVM_VERSION: 22.1.6
       run: |
         # Initialize hardened libc++ action
         "${GITHUB_ACTION_PATH}/init.sh"