deps: Update actions/setup-dotnet action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/setup-dotnet	action	major	v5 → v6

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Release Notes

actions/setup-dotnet (actions/setup-dotnet)

v6.0.0

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What's Changed

• Migrate to ESM and upgrade dependencies by @​priyagupta108 in #​752
• Bump actions/checkout from 6.0.3 to 7.0.0 by @​dependabot[bot] in #​751
• chore(deps): bump @​actions/cache to 6.2.0 by @​philip-gai in #​756

New Contributors

• @​philip-gai made their first contribution in #​756

Full Changelog: actions/setup-dotnet@v5...v6.0.0

v6

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[chatgpt-codex-connector]

Update the canonical publish template instead

This workflow declares itself a canonical copy owned by ANcpLua/github-settings-automation/templates/nuget-publish.yml and warns consumer-repo edits are overwritten by the next enforce-repo-settings.yml sync; the current canonical template still pins actions/setup-dotnet to the old v5 SHA. With this change only in the consumer copy, the publish workflow will revert on the next sync and the dependency update will not stick, so update the canonical template (rather than this generated copy) before merging.

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