Use Authorization header instead of access_token for Github call

[hsubox76]

Github has been warning about deprecation of the access_token query param and asking users to use the Authorization header instead.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 8f0edfd

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

Changeset File Check ⚠️

• Changeset formatting error in following file:

  Some packages have been changed but no changesets were found. Run `changeset add` to resolve this error.
  If this change doesn't need a release, run `changeset add --empty`.
  

[google-oss-bot]

Binary Size Report

Affected SDKs

No changes between base commit (49b0406) and head commit (c98ead1).

Test Logs

• Base (49b0406a): https://github.com/firebase/firebase-js-sdk/actions/runs/1279462829
• Head (c98ead14): https://github.com/firebase/firebase-js-sdk/actions/runs/1280182313

[google-oss-bot]

Size Analysis Report

Affected Products

No changes between base commit (49b0406) and head commit (c98ead1).

Test Logs

• Base (49b0406): https://github.com/firebase/firebase-js-sdk/actions/runs/1279462829
• Head (c98ead1): https://github.com/firebase/firebase-js-sdk/actions/runs/1280182313