chore(deps, cpp)!: update mull-20 (#1282)

Update mull-20

Co-authored-by: philips-software-forest-releaser[bot] <80338643+philips-software-forest-releaser[bot]@users.noreply.github.com>

Author: philips-software-forest-releaser[bot]

.devcontainer/cpp/apt-requirements-clang.json

@@ -7,5 +7,5 @@
   "libclang-rt-20-dev": "1:20.1.8-2ubuntu8",
   "lld-20": "1:20.1.8-2ubuntu8",
   "llvm-20": "1:20.1.8-2ubuntu8",
-  "mull-20": "0.33.0"
+  "mull-20": "0.34.0"
 }