MAINT: Update black and fix bugbear

[bashtage]

Update black
Fix nested exceptions

• closes #xxxx
• tests added / passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• passes black --check pandas_datareader
• added entry to docs/source/whatsnew/vLATEST.txt

[codecov-commenter]

Codecov Report

Merging #934 (9fc1cca) into main (fdade48) will decrease coverage by 11.17%.
The diff coverage is 43.75%.

❗ Current head 9fc1cca differs from pull request most recent head 091f55e. Consider uploading reports for the commit 091f55e to get more accurate results

@@             Coverage Diff             @@
##             main     #934       +/-   ##
===========================================
- Coverage   73.19%   62.02%   -11.18%     
===========================================
  Files          65       65               
  Lines        2932     2928        -4     
  Branches      315      413       +98     
===========================================
- Hits         2146     1816      -330     
- Misses        704     1048      +344     
+ Partials       82       64       -18     

Impacted Files	Coverage Δ
pandas_datareader/_utils.py	87.50% <0.00%> (ø)
pandas_datareader/av/__init__.py	50.00% <ø> (ø)
pandas_datareader/av/forex.py	27.65% <0.00%> (ø)
pandas_datareader/base.py	86.23% <0.00%> (+2.17%)	⬆️
pandas_datareader/famafrench.py	96.20% <0.00%> (ø)
pandas_datareader/fred.py	100.00% <ø> (ø)
pandas_datareader/io/jsdmx.py	97.14% <ø> (+2.62%)	⬆️
pandas_datareader/nasdaq_trader.py	63.46% <0.00%> (ø)
pandas_datareader/tests/io/test_jsdmx.py	100.00% <ø> (ø)
pandas_datareader/wb.py	3.40% <0.00%> (-87.08%)	⬇️
... and 20 more

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