Update GTAG

[svekars]

• Update to the new GTAG

cc @carljparker

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[pytorch-bot]

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[carljparker]

This PR is in furtherance of our migration from Universal Analytics to Google Analytics 4. (Please see the corresponding issue for additional detail.)

Part of the migration requires updating our pages to use a new type of ID tag--specifically, a Google Tag ID instead of the Tracking ID used by Universal Analytics. (Google Tag IDs are recognizable by their "G-" prefix; Universal Analytics Tracking IDs have a "UA-" prefix.)

Because PyTorch is now under the governance of Linux Foundation (LF), they have collaborated with us on the migration: LF obtained a Google Tag ID to use for our websites. This PR adds that ID to our pages via our page templating system.

For more information, please see the following Issue in the pytorch.github.io repository:

pytorch/pytorch.github.io#1397