[Bug 1883175] [NEW] missing support for python3.8 language features

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Python 3.8 language features include some syntax that python3-flake8
3.7.9-2 registers as an error.

flake8 3.8.x is now available, released after Focal. The minor version
matches the supported python version, so a release from the 3.8.x series
should be ported to Focal. This version bump requires dependency
pycodestyle >= 2.6.0, which is where the bugfix occurs.

[Test Case]
Create a file test.py
Use python3 language features, e.g.
```
while (a := float(input())) < 10 :
    print(f'{a=} is too much!')
print(f'{a=} works fine')
```
Run `python3 -m flake8 test.py`

Result:
"pyflakes" failed during execution due to "'FlakesChecker' object has no attribute 'NAMEDEXPR'"
Run flake8 with greater verbosity to see more details
test.py:1:9: E203 whitespace before ':'
test.py:1:10: E231 missing whitespace after ':'

`echo $?` shows a return value of 1

With the 3.8.3-1 version of the package proposed for Groovy
(https://launchpad.net/ubuntu/+source/python-flake8/3.8.3-1) `test.py`
produces no output and returns 0

[Regression Potential]
Potential is minimal as this is a minor version bump, which upstream defines as only offering additional, optional checks and not breaking backward compatibility. No reported breakages between 3.7.9 and 3.8.3 are shown in upstream issue tracker.

Any regressions would appear as unexpected errors emitted when running
the linter on previously error-less, valid python code.

Upstream QA:
https://flake8.pycqa.org/en/latest/internal/releases.html#process
outlines the required tests a release must pass, all of which completed
in https://gitlab.com/pycqa/flake8/-/pipelines/154124695

** Affects: pycodestyle (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: pyflakes (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: python-flake8 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: patch
-- 
missing support for python3.8 language features
https://bugs.launchpad.net/bugs/1883175
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