Prepare to maybe drop 3.9

[Carreau]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 96.87500% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 56.30%. Comparing base (41733ec) to head (bd78b0c).
⚠️ Report is 225 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/python/pyflyby/_parse.py	83.33%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (41733ec) and HEAD (bd78b0c). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (41733ec)	HEAD (bd78b0c)
	10	7

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #460       +/-   ##
===========================================
- Coverage   67.97%   56.30%   -11.68%     
===========================================
  Files          25       29        +4     
  Lines        8012     8712      +700     
===========================================
- Hits         5446     4905      -541     
- Misses       2566     3807     +1241     

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[Carreau]

We got approval to drop 3.9