LLVM 23 toolchain folder is missing for jammy

it seems that the jammy repo is missing the toolchain folder for LLVM 23 in https://apt.llvm.org/jammy/dists/ . This breaks installing llvm 23 using the llvm.sh script.

To reproduce run the following:
```
docker run --rm -it ubuntu:jammy bash -c "apt-get update && apt-get install -y lsb-release wget software-properties-common gnupg && wget https://apt.llvm.org/llvm.sh && bash llvm.sh 23"
```

which fails with:

```
Err:6 https://apt.llvm.org/jammy llvm-toolchain-jammy-23 Release
404 Not Found [IP: 146.75.118.49 443]
Reading package lists... Done
```

Start by running the provided Ubuntu Jammy Docker reproduction and inspect llvm.sh together with the apt.llvm.org jammy distribution path. Confirm which release or repository configuration is responsible for the missing LLVM 23 toolchain folder; done means the script can install LLVM 23 on Jammy without the 404 error.

Written by the indexing model from the issue text.