chore: remove duplicate package import

[asttool]

What does this pull request do? Explain your changes. (required)

"github.com/livepeer/go-livepeer/net" was imported twice.
I remove the duplicate import to make the code cleaner and more readable.

Specific updates (required)

How did you test each of these updates (required)

Does this pull request close any open issues?

Checklist:

• Read the contribution guide
• make runs successfully
• All tests in ./test.sh pass
• README and other documentation updated
• Pending changelog updated

[asttool]

@victorges @j0sh Hi, Could you please review this PR at your convenience? Thank you very much.

[victorges]

Neat!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 31.52335%. Comparing base (f56f5d5) to head (981e94f).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@                 Coverage Diff                 @@
##              master       #3775         +/-   ##
===================================================
- Coverage   31.52544%   31.52335%   -0.00209%     
===================================================
  Files            159         159                 
  Lines          47901       47901                 
===================================================
- Hits           15101       15100          -1     
- Misses         31911       31912          +1     
  Partials         889         889                 

see 1 file with indirect coverage changes

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