Toolchain update: pnpm 11.28.2

[github-actions]

pnpm 11.28.0 -> 11.28.2 (newest 11.x at least 5 days old is 11.28.2; pinned pnpm@11.28.0).

This pull request changes only packageManager in package.json, and CI has been started on it: the whole of pnpm run verify, on Linux and on Windows.

Routine: update-prs.yml tells @Nawid3333 once CI has run whether it is ready to merge, and the merge is theirs.

The lockfile is left as it is. Should this pnpm want it rewritten, CI fails at the install: run pnpm install with it and push pnpm-lock.yaml here (the pull request then waits for you).

Nothing here is part of the extension: its build should come out unchanged, and a merge then releases nothing (auto-release.yml compares the builds).

_{Opened by https://github.com/Nawid3333/FastStream/actions/runs/37278747585}

[github-actions]

@Nawid3333 CI passes on this pull request (https://github.com/Nawid3333/FastStream/actions/runs/37278776556), and every check holds: ready for you to merge.

Its build of the extension is file for file the one in v1.3.82.59, the version number aside: merging it releases nothing.

Closing this pull request skips this version for good; toolchain-updates.yml raises the next one.

_{https://github.com/Nawid3333/FastStream/actions/runs/37283026558}