Fix job definition syntax in migration tutorial

[NenoLoje]

Fixed 1 minor issue in a code sample that would result in invalid YAML.

• No functional changes are introduced.
• Fixed by removing an unnecessary colon from a job definition.

[github-actions]

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Source	Review	Production	What Changed
actions/tutorials/migrate-to-github-actions/manual-migrations/migrate-from-azure-pipelines.md	fpt ghec ghes@ 3.19 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.19 3.18 3.17 3.16 3.15 3.14

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[Copilot]

Pull request overview

This PR fixes an invalid YAML syntax error in the Azure Pipelines migration tutorial documentation. The change corrects a code sample that would have resulted in malformed YAML configuration.

Key Changes:

• Removed trailing colon from fanin job definition to conform to valid Azure Pipelines YAML syntax

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