Firebase Admin .NET SDK v3.4.0

New Features

• feat(auth): Add LinkDomain to ActionCodeSettings and deprecate DynamicLinkDomain (#475)

Bug Fixes

• fix(auth): Fixed auth error code parsing (#479)

Miscellaneous

• [chore] Release 3.4.0 (#480)
• chore: Deprecate .NET 6.0 and 7.0 (#482)
• chore(deps): bump actions/download-artifact from 4.3.0 to 5.0.0 (#476)
• chore(deps): bump actions/checkout from 4 to 5 (#477)
• chore: Added an AGENTS.md file to instruct AI agents how to interact with this repository (#474)