ci: add area/dependency label for dependabot PRs

[aramase]

I'm explicitly configuring it to use the same label that Dependabot applies by default. If a custom label is specified in the config, Dependabot doesn't add the default labels.

(xref: https://github.com/kubernetes/release/blob/b28854edebcb345c31260b53510368725225b079/.github/dependabot.yml#L8) for other places we do this.

[aramase]

/triage accepted
/assign enj

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.60%. Comparing base (87f51ec) to head (e2c1597).
Report is 148 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1802      +/-   ##
==========================================
+ Coverage   35.83%   36.60%   +0.77%     
==========================================
  Files          63       63              
  Lines        3759     4535     +776     
==========================================
+ Hits         1347     1660     +313     
- Misses       2268     2731     +463     
  Partials      144      144              

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[enj]

/lgtm
/approve

[k8s-ci-robot]

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