chore: move Dependabot config to .github/dependabot.yml

[iyiolacak]

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• This PR references an issue (except for typos, broken links, or other minor problems)

Description(required)

This PR moves the file to .github/dependabot.yml, which is the correct location for Dependabot configs.

Why it matters

• CI no longer fails on the invalid workflow.
• Dependabot is correctly recognized and will continue to manage dependencies as intended.

Related issues & labels

• No related issue (repo housekeeping / CI fix)
• Suggested label(s): chore, ci, infrastructure

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