Verify (and update) the commit SHA of googletest within the cgmanifest.json files in the repo

[ahsonkhan]

          Is this the actual commit we are using?

Originally posted by @LarryOsterman in #6176 (comment)

azure-sdk-for-cpp/sdk/template/azure-template/cgmanifest.json

Lines 8 to 9 in 3687136

	"RepositoryUrl": "https://github.com/google/googletest",
	"CommitHash": "703bd9caab50b139428cea1aaff9974ebee5742e"

This is the SHA that's specified in the template, keyvault, eventhubs, and attestation packages. If we need to update it, we'd want to do so everywhere in the repo.