Bump Google.Api.Gax.Rest and Google.Apis.Auth

Bumps Google.Api.Gax.Rest from 4.8.0 to 4.11.0
Bumps Google.Apis.Auth from 1.68.0 to 1.69.0

---
updated-dependencies:
- dependency-name: Google.Api.Gax.Rest
  dependency-version: 4.11.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: Google.Apis.Auth
  dependency-version: 1.69.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

FirebaseAdmin/FirebaseAdmin/FirebaseAdmin.csproj

@@ -30,8 +30,8 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.3" PrivateAssets="All" />
-    <PackageReference Include="Google.Api.Gax.Rest" Version="4.8.0" />
-    <PackageReference Include="Google.Apis.Auth" Version="1.68.0" />
+    <PackageReference Include="Google.Api.Gax.Rest" Version="4.11.0" />
+    <PackageReference Include="Google.Apis.Auth" Version="1.69.0" />
     <PackageReference Include="System.Collections.Immutable" Version="8.0.0" />
     <PackageReference Include="StyleCop.Analyzers" Version="1.2.0-beta.556">
       <PrivateAssets>all</PrivateAssets>