Fix Dependabot ignore statements

[desrosj]

What?

The dependabot.yml file does not support * for a version in ignore statements. Omitting the version all together properly ignores all versions.

Follow up to #69118 and #69122.

Testing Instructions

I've confirmed this works as expected on my fork.

[github-actions]

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[github-actions]

Flaky tests detected in b3acdf6.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/13265248225
📝 Reported issues:

• [Flaky Test] should show the original content after revert #47897 in /test/e2e/specs/site-editor/template-revert.spec.js