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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