Update actions/setup-dotnet action to v5.3.0

[dependencyupdates]

This PR contains the following updates:

Package	Type	Update	Change
actions/setup-dotnet	action	minor	v5.2.0 → v5.3.0

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Release Notes

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

v5.3.0

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What's Changed

Enhancements

• Add dotnet-version: latest support with dotnet-channel input by @​mahabaleshwars in #​730
• Support global.json's rollForward latest* variants by @​js6pak in #​538
• Improve version resolution by @​akoeplinger in #​560

Dependency Updates

• Upgrade @​actions/* and fast-xml-parser dependencies by @​Copilot in #​728
• Update install scripts to v2026.05.19 (preserve archive links) by @​MichaelSimons in #​736
• Add rollForward note in README, improve proxy health check in e2e tests and bump version to v5.3.0 by @​priyagupta108 in #​738

Bug Fixes

• Update Test Proxy job by @​priya-kinthali in #​703

New Contributors

• @​Copilot made their first contribution in #​728
• @​akoeplinger made their first contribution in #​560
• @​MichaelSimons made their first contribution in #​736
• @​js6pak made their first contribution in #​538

Full Changelog: actions/setup-dotnet@v5...v5.3.0

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