chore: [pre-commit.ci] pre-commit autoupdate

[pre-commit-ci]

updates:

• github.com/asottile/pyupgrade: v2.19.4 → v2.20.0
• github.com/nbQA-dev/nbQA: 0.12.0 → 0.13.1

* Update pre-commit hooks:
   - github.com/asottile/pyupgrade: v2.19.4 → v2.20.0
   - github.com/nbQA-dev/nbQA: 0.12.0 → 0.13.1
* Deprecate xml.etree.cElementTree in favor of xml.etree.ElementTree API
   - The xml.etree.cElementTree module is deprecated since Python v3.3
   - c.f. https://docs.python.org/3.9/library/xml.etree.elementtree.html
* Move nbqa-pyupgrade before nbqa-black to have notebook changes happen before Black

[codecov]

Codecov Report

Merging #1520 (b7834ff) into master (cc7cf0f) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1520   +/-   ##
=======================================
  Coverage   97.65%   97.65%           
=======================================
  Files          63       63           
  Lines        4006     4006           
  Branches      565      565           
=======================================
  Hits         3912     3912           
  Misses         55       55           
  Partials       39       39           

Flag	Coverage Δ
contrib	25.51% <0.00%> (ø)
unittests	97.42% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/pyhf/writexml.py	95.91% <100.00%> (ø)

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