nixpkgs decides which prettier and gofumpt format the tree. A lock bump to
prettier 3.9.6 reformatted CHANGELOG.md, which no area had touched, and the
formatting check failed on a file the bot never edited.
Keeps the interlocked pins current and reports what it could not move.
Areas apply, gate and commit one at a time, so a dependency that breaks
the build costs one commit rather than the whole pull request.