chore(deps): update dependency google.apis to 1.73.0

Author: renovate-bot

tools/Google.Cloud.ClientTesting/Google.Cloud.ClientTesting.csproj

@@ -14,7 +14,7 @@
     <PackageReference Include="xunit.assert" />
     <PackageReference Include="xunit.core" />
     <PackageReference Include="Xunit.SkippableFact" />
-    <PackageReference Include="Google.Apis" VersionOverride="1.72.0" />
+    <PackageReference Include="Google.Apis" VersionOverride="1.73.0" />
     <PackageReference Include="Grpc.Core.Api" VersionOverride="2.66.0" />
     <PackageReference Include="Google.Api.Gax" />
     <PackageReference Include="Google.Protobuf" />