[PR #8672/c3219bf backport][3.11] Fix TCPConnector doing blocking I/O in the event loop to create the SSLContext

[bdraco]

Co-authored-by: Sam Bull git@sambull.org
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
(cherry picked from commit c3219bf)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.65%. Comparing base (3f452a0) to head (5177268).

Additional details and impacted files

@@            Coverage Diff             @@
##             3.11    #8674      +/-   ##
==========================================
+ Coverage   97.64%   97.65%   +0.01%     
==========================================
  Files         108      108              
  Lines       33984    34015      +31     
  Branches     4047     4047              
==========================================
+ Hits        33185    33219      +34     
+ Misses        598      595       -3     
  Partials      201      201              

Flag	Coverage Δ
CI-GHA	97.56% <100.00%> (+0.01%)	⬆️
OS-Linux	97.24% <100.00%> (+0.07%)	⬆️
OS-Windows	94.82% <100.00%> (+0.09%)	⬆️
OS-macOS	96.96% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	97.06% <100.00%> (+<0.01%)	⬆️
Py-3.10.14	97.01% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	96.95% <100.00%> (-0.29%)	⬇️
Py-3.12.4	97.25% <100.00%> (+0.21%)	⬆️
Py-3.8.10	94.43% <100.00%> (+0.01%)	⬆️
Py-3.8.18	96.79% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	96.94% <100.00%> (+0.32%)	⬆️
Py-3.9.19	96.90% <100.00%> (?)
VM-macos	96.96% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	97.24% <100.00%> (+0.07%)	⬆️
VM-windows	94.82% <100.00%> (+0.09%)	⬆️

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