[repo-assist] Engineering: bump CI action major versions

Review .github/workflows/pull-request.yml and .github/workflows/publish.yml, focusing on the pinned actions/checkout, actions/setup-dotnet, and actions/setup-node versions. Confirm the action version updates match the summary, then run dotnet build FSharp.Control.AsyncSeq.sln -c Release and dotnet test tests/FSharp.Control.AsyncSeq.Tests -c Release. Done means the workflows use the requested versions and all 497 tests pass.

[!CAUTION]
Protected files were modified in this change.
This pull request is in request_review mode and requires explicit human scrutiny before merge.

Protected files: .github/workflows/publish.yml, .github/workflows/pull-request.yml

Summary

Updates GitHub Actions used in this repo's CI workflows to their latest major versions:

Applied to both .github/workflows/pull-request.yml and .github/workflows/publish.yml (setup-node is only used in pull-request.yml).

No functional changes to the build/test steps themselves — only the pinned action versions change. This follows up on a prior (now stale) attempt at the same upgrade.

Test Status

• dotnet build FSharp.Control.AsyncSeq.sln -c Release — succeeded, 0 errors.
• dotnet test tests/FSharp.Control.AsyncSeq.Tests -c Release — 497/497 tests passed.
• Workflow YAML changes only affect action pinning; CI will validate the updated actions run correctly once this PR's own checks execute.

🤖 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.

[!NOTE]
This was originally intended as a pull request, but the git push operation failed.

Original error: The process '/usr/bin/git' failed with exit code 1

Workflow Run: View run details and download bundle artifact

The bundle file is available in the agent artifact in the workflow run linked above.

# Download the artifact from the workflow run
gh run download '35002914803' -n agent -D '/tmp/agent-35002914803'

# Resolve the bundle source ref, fetch it into a temporary ref, then create the local branch
bundle_path='/tmp/agent-35002914803/aw-repo-assist-eng-update-ci-actions-20260915.bundle'
temp_ref='refs/bundles/create-pr-repo-assist-eng-update-ci-actions-20260915-e9faa3c16722cdaf-ae3d506e'
target_ref='refs/heads/repo-assist/eng-update-ci-actions-20260915-e9faa3c16722cdaf'
bundle_source_ref=$(git bundle list-heads "$bundle_path" | awk '$2 ~ /^refs\/heads\// { print $2 }')
if [ -z "$bundle_source_ref" ]; then
  bundle_source_ref=$(git bundle list-heads "$bundle_path" | awk '$2 == "HEAD" { print $2 }')
fi
if [ "$(printf '%s\n' "$bundle_source_ref" | sed '/^$/d' | wc -l | tr -d ' ')" != "1" ]; then
  echo "Expected exactly one bundle source ref, found: $bundle_source_ref" >&2
  exit 1
fi
git fetch "$bundle_path" "${bundle_source_ref}:${temp_ref}"
git update-ref "$target_ref" "$temp_ref"
git checkout 'repo-assist/eng-update-ci-actions-20260915-e9faa3c16722cdaf'
# Ensure the working tree matches the updated branch
git reset --hard
# Remove the temporary bundle ref
git update-ref -d "$temp_ref"

# Push the branch to the target remote
git push 'origin' 'repo-assist/eng-update-ci-actions-20260915-e9faa3c16722cdaf'

# Create the pull request
gh pr create --title '[repo-assist] Engineering: bump CI action major versions' --base 'main' --head 'repo-assist/eng-update-ci-actions-20260915-e9faa3c16722cdaf' --repo 'fsprojects/FSharp.Control.AsyncSeq'

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

gh aw add githubnext/agentics/workflows/repo-assist.md@4bc8419fad05e6b032741cbfd189986700bcf71c