Update langchain-observability-snippet.ipynb

[jpantsjoha]

fixing the auth snippet section

[google-cla[bot]]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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[RajeshThallam]

@jpantsjoha Thanks for the contribution. Can you please look at the failed checks? You may have to sign the CLA?

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[jpantsjoha]

done. CLA signed.

[michaelwsherman]

Still errors -- click into the CLA error, make sure you've signed it with that email.

Also, there's a merge conflict, please resolve that so it can be merged into main.

Thank you!