chore(deps): remove `proxy-agent` and `form-data` in favor of `undici`

[codecov[bot]]

Codecov Report

Base: 83.41% // Head: 83.41% // No change to project coverage :thumbsup:

Coverage data is based on head (9607e34) compared to base (6926407). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #672 +/- ## ======================================= Coverage 83.41% 83.41% ======================================= Files 37 37 Lines 4136 4136 ======================================= Hits 3450 3450 Misses 686 686 ``` | [Impacted Files](https://codecov.io/gh/nodejs/node-core-utils/pull/672?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [lib/ci/run\_ci.js](https://codecov.io/gh/nodejs/node-core-utils/pull/672?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-bGliL2NpL3J1bl9jaS5qcw==) | `75.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None)

:umbrella: View full report at Codecov.
:loudspeaker: Do you have feedback about the report comment? Let us know in this issue.