Fix Dependabot config

[reinkrul]

https://github.com/nuts-foundation/nuts-node/pull/3958/checks?check_run_id=63496742987

The property '#/updates/2/ignore/0/versions' includes invalid version requirements for a docker ignore condition

No guarantees

[qltysh]

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[gerardsn]

Why does dependabot run on a PR?

I don't think this is going to work since GO is violating the semver syntax.
It should be x.y.z-[0-9A-Za-z-], but go does x.yRC-2

I'm fine merging this to prevent blocking other PRs