chore(deno): update to debian-2.6.3

[github-actions]

Automated Version Update

Updates deno from 2.6.0 to debian-2.6.3.

Changes

• Updated version in Earthfile

Validation

• Quick benchmark test passed with QUICK_TEST_ROUNDS=10000

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This PR was automatically created by the version-check workflow.
Use /bench deno to run a full benchmark before merging.

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