LLVM 21 .debs (mirror of apt.llvm.org)

LLVM 21 .debs from apt.llvm.org, mirrored so the Dockerfiles do not depend on apt.llvm.org at build time. Regenerate with scripts/mirror-llvm-debs.sh (or the mirror-llvm-debs workflow).

tarball	clang-21 version	files	sha256
llvm-21-focal-amd64.tar.gz	1:21.1.5~++20251023083255+45afac62e373-1exp120251023083404.50	31	759ea9d6d50de9b6062cf40161a24a3a9d70aaf11aa1a544074d126590eb55f7
llvm-21-focal-arm64.tar.gz	1:21.1.5~++20251023083255+45afac62e373-1exp120251023083404.50	31	4d4923baa663cb2e1be67e8e7097220604489b0da8b7a4ab5911ac2baf1e0ba6
llvm-21-noble-amd64.tar.gz	1:21.1.8~++20251221032922+2078da43e25a-1exp120251221153059.70	17	4a79b0eae89af72b082997d361198f16aaefce3fa8ad3c56c8e97311ff31dd5f