fix local_addr annotation in TCPConnector.__init__

[Hanaasagi]

From the doc

• local_addr (tuple) – tuple of (local_host, local_port) used to bind socket locally if specified.

resolve #3639

[codecov-io]

Codecov Report

Merging #3657 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3657   +/-   ##
=======================================
  Coverage   94.83%   94.83%           
=======================================
  Files          43       43           
  Lines        8555     8555           
  Branches     1375     1375           
=======================================
  Hits         8113     8113           
  Misses        337      337           
  Partials      105      105

Impacted Files	Coverage Δ
aiohttp/connector.py	96.18% <ø> (ø)	⬆️

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[asvetlov]

Resolved by #3732

@Hanaasagi thank for the PR.
Sorry, I've merged the very similar code just before looking on your implementation