chore(deps): bump Google.Apis.Auth from 1.67.0 to 1.68.0 in /FirebaseAdmin

[dependabot[bot]]

Bumps Google.Apis.Auth from 1.67.0 to 1.68.0.

Release notes

Sourced from Google.Apis.Auth's releases.

API versioning support

Features:

• API versioning support implemented in both support and generated libraries.

Commits

• f7788cc Update discovery documents and generated code
• a8db127 chore: Skip generation of Integrations V1.
• 54feb73 Update generated 1.67.0 -> 1.68.0
• 984b6d6 chore: Update generator to support API versioning.
• 6f4cb66 Update discovery documents and generated code
• c278bbe refactor: Minor improvements to IsLinuxGoogleBiosAsync
• 90f0a47 Update discovery documents and generated code
• 32fcc76 Update discovery documents and generated code
• 5b340dd chore(deps): update xunit-dotnet monorepo
• a75525c Update support version 1.67.0 -> 1.68.0
• Additional commits viewable in compare view

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