[pytorch/executorch][diff_train] Add maven version in main in Getting Started page (#9980)

[kimishpatel]

Stack from ghstack (oldest at bottom):

• (to be filled)

Internal:
<< DO NOT EDIT BELOW THIS LINE >>

GitHub Author: Mergen Nachin [email protected] (Meta Employee)
GitHub Repo: pytorch/executorch
GitHub Pull Request: #9980

Initially generated by: https://www.internalfb.com/intern/sandcastle/job/36028798801202800/

This was imported as part of a Diff Train.
Please review this as soon as possible. Since it is a direct copy of a commit on
GitHub, there shouldn't be much to do.

diff-train-source-id: 9b7a878

Differential Revision: D72729754

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/10047

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 1 New Failure, 1 Cancelled Job, 13 Pending

As of commit 8ba1f94 with merge base 1facfa9 ():

NEW FAILURE - The following job has failed:

• Check Labels / Check labels (gh)
  RuntimeError: Error checking labels: PR does not have required labels

CANCELLED JOB - The following job was cancelled. Please retry:

• pull / test-eval_llama-wikitext-linux / linux-job (gh)
  ##[error]The operation was canceled.

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[github-actions]

This PR needs a release notes: label

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@pytorchbot label "topic: not user facing"

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[kimishpatel]

accidentally ran ghexport on top of this