bpo-39775: inspect: Change Signature.parameters back to OrderedDict.

[methane]

https://bugs.python.org/issue39775

[codecov]

Codecov Report

Merging #18684 into master will increase coverage by 1.08%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master   #18684       +/-   ##
===========================================
+ Coverage   82.12%   83.21%    +1.08%     
===========================================
  Files        1956     1571      -385     
  Lines      589863   415173   -174690     
  Branches    44477    44478        +1     
===========================================
- Hits       484444   345488   -138956     
+ Misses      95774    60037    -35737     
- Partials     9645     9648        +3     

Impacted Files	Coverage Δ
Lib/distutils/tests/test_bdist_rpm.py	30.00% <0.00%> (-65.00%)	⬇️
Lib/distutils/command/bdist_rpm.py	7.63% <0.00%> (-56.88%)	⬇️
Lib/test/test_urllib2net.py	76.92% <0.00%> (-13.85%)	⬇️
Lib/test/test_smtpnet.py	78.57% <0.00%> (-7.15%)	⬇️
Lib/ftplib.py	63.85% <0.00%> (-6.06%)	⬇️
Lib/test/test_ftplib.py	87.11% <0.00%> (-4.72%)	⬇️
Tools/scripts/db2pickle.py	17.82% <0.00%> (-3.97%)	⬇️
Tools/scripts/pickle2db.py	16.98% <0.00%> (-3.78%)	⬇️
Lib/test/test_socket.py	71.94% <0.00%> (-3.77%)	⬇️
Lib/test/test_asyncio/test_base_events.py	91.84% <0.00%> (-3.30%)	⬇️
... and 435 more

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