Disable dependabot for Rust

[saschagrunert]

What type of PR is this?

/kind ci

What this PR does / why we need it:

Dependabot does not support vendored cargo, so we have to disable it for now.

Which issue(s) this PR fixes:

None

Special notes for your reviewer:

None

Does this PR introduce a user-facing change?

None

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: saschagrunert

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/containers/conmon-rs/blob/main/OWNERS)~~ [saschagrunert] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 47.63%. Comparing base (4e0f474) to head (29be9a0). Report is 668 commits behind head on main.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2385 +/- ## =========================================== + Coverage 37.53% 47.63% +10.09% =========================================== Files 15 121 +106 Lines 1268 4003 +2735 Branches 414 833 +419 =========================================== + Hits 476 1907 +1431 - Misses 526 1586 +1060 - Partials 266 510 +244 ```

[rphillips]

/lgtm