[repo-assist] Update CI action versions in workflow files

[github-actions]

Summary

Updates the GitHub Actions used in pull-request.yml and publish.yml to their latest major versions:

• actions/checkout v4 → v7.0.1
• actions/setup-dotnet v4.3.1 → v6.0.0
• actions/setup-node v4 → v7.0.0

These are the same actions used elsewhere in the repo (e.g. the repo-assist agentic workflow already pins actions/checkout@v7.0.1), so this keeps the CI/publish workflows consistent and current.

Test Status

• dotnet build FSharp.Control.AsyncSeq.sln -c Release — succeeded, 0 errors (pre-existing warnings unrelated to this change).
• dotnet test tests/FSharp.Control.AsyncSeq.Tests -c Release — 486/486 tests passed.
• Workflow YAML changes only; no source code was touched, so no behavioral risk beyond the CI runner update itself.

---

🤖 This PR was created by Repo Assist, an automated AI assistant, as part of scheduled engineering-investment maintenance (Task 4). A human maintainer should review before merging.

---

Warning

Protected Files — Push Permission Denied

This was originally intended as a pull request, but the patch modifies protected files. A human must create the pull request manually.

Protected files

• .github/workflows/publish.yml

• .github/workflows/pull-request.yml

The push was rejected because GitHub Actions does not have workflows permission to push these changes, and is never allowed to make such changes, or other authorization being used does not have this permission.

Create the pull request manually

# Download the patch from the workflow run
gh run download 33539311534 -n agent -D /tmp/agent-33539311534

# Create a new branch
git checkout -b repo-assist/eng-update-ci-actions-20260901-f8a805cae4cbede4 main

# Apply the patch (--3way handles cross-repo patches)
git am --3way /tmp/agent-33539311534/aw-repo-assist-eng-update-ci-actions-20260901.patch

# Push the branch and create the pull request
git push origin repo-assist/eng-update-ci-actions-20260901-f8a805cae4cbede4
gh pr create --title '[repo-assist] Update CI action versions in workflow files' --base main --head repo-assist/eng-update-ci-actions-20260901-f8a805cae4cbede4 --repo fsprojects/FSharp.Control.AsyncSeq

Generated by 🌈 Repo Assist, see workflow run. Learn more.
_{Comment /repo-assist to run again}

_{Add this agentic workflow to your repo}

To install this agentic workflow, run

gh aw add githubnext/agentics/workflows/repo-assist.md@ae8d551f07c7ed7619f8c58c7bb4c3ac89395d38