[Repo Assist] Prepare release 4.1.0

[github-actions]

🤖 This PR was created by Repo Assist, an automated AI assistant.

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Summary

Bumps the version from 4.0.0 → 4.1.0 and updates RELEASE_NOTES.md to document the new combinators added since the 4.0.0 release.

What's new in 4.1.0

PR	Feature
#241	AsyncSeq.windowed — sliding-window combinator
#242	AsyncSeq.reduce / AsyncSeq.reduceAsync
#245	AsyncSeq.sumBy, sumByAsync, average, averageBy, averageByAsync

Note: PR #243 (AsyncSeq.min/max/minBy/maxBy) is still open. If that lands before this PR is merged, the release notes and version are ready to be amended to include it (or it can ship in 4.1.1/4.2.0).

Changes

• version.props: 4.0.0 → 4.1.0
• RELEASE_NOTES.md: added ### 4.1.0 section

Test Status

All 212 tests pass ✅ (pre-existing Fable build errors are unrelated to this change — they exist on main before this PR).

Generated by Repo Assist

Generated by Repo Assist

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[github-actions]

Pull request created: #246