Update github/gh-aw action to v0.68.1 #38801

Job	Run time
Setup	3m 18s
Comments-UI tests	1s
Admin tests - Chrome	1s
Acceptance tests (Node ${{ matrix.node }}, ${{ matrix.env.DB }})	1s
Legacy tests (Node ${{ matrix.node }}, ${{ matrix.env.DB }})	1s
ActivityPub tests	1s
Check app version bump	1s
i18n	1s
Coverage	1s
Ghost-CLI tests	1s
Build E2E Public App Assets	1s
Signup-form tests	1s
Build & Publish Artifacts	1s
Trigger Pro CD	1s
Admin-X Settings tests	1s
Publish ${{ matrix.package_name }}	1s
Tinybird Tests	1s
Merge Reports	4m 17s
All required tests passed or skipped	3s
Unit tests (Node ${{ matrix.node }})	1s
Build E2E Docker Image	1s
Lint	1s
Deploy Tinybird	1s
Publish Ghost to npm	1s
Create GitHub Release	1s
E2E Tests (${{ matrix.shardIndex }}/${{ matrix.shardTotal }})	1s
	8m 1s

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