Update dependabot config

[ivanvc]

Follow up on #22093 (comment)

1. Disable indirect dependency bumps. We only bump indirect dependencies if there's a vulnerability, and that's handled by Dependabot security updates.
2. Offboard Docker updates for release-3.4, onboard release-3.7.

[kubernetes-prow]

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[kubernetes-prow]

@ivanvc: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-etcd-grpcproxy-integration-amd64	3f99fe7	link	true	/test pull-etcd-grpcproxy-integration-amd64
pull-etcd-robustness-arm64	3f99fe7	link	true	/test pull-etcd-robustness-arm64
pull-etcd-coverage-report	3f99fe7	link	true	/test pull-etcd-coverage-report

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.64%. Comparing base (6006f40) to head (3f99fe7).

Additional details and impacted files

see 19 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #22111      +/-   ##
==========================================
- Coverage   69.73%   69.64%   -0.09%     
==========================================
  Files         449      449              
  Lines       38177    38177              
==========================================
- Hits        26624    26590      -34     
- Misses      10123    10155      +32     
- Partials     1430     1432       +2     

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