Add pyupgrade and django-upgrade pre-commit hooks

[matthiask]

No description provided.

[codecov]

Codecov Report

Merging #1553 (3eff33d) into main (8de6921) will not change coverage.
The diff coverage is 69.23%.

@@           Coverage Diff           @@
##             main    #1553   +/-   ##
=======================================
  Coverage   86.46%   86.46%           
=======================================
  Files          36       36           
  Lines        1862     1862           
  Branches      303      303           
=======================================
  Hits         1610     1610           
  Misses        178      178           
  Partials       74       74           

Impacted Files	Coverage Δ
debug_toolbar/panels/cache.py	78.66% <0.00%> (ø)
debug_toolbar/panels/profiling.py	85.41% <0.00%> (ø)
debug_toolbar/panels/templates/views.py	62.79% <0.00%> (ø)
debug_toolbar/utils.py	76.47% <50.00%> (ø)
debug_toolbar/management/commands/debugsqlshell.py	100.00% <100.00%> (ø)
debug_toolbar/panels/signals.py	86.36% <100.00%> (ø)
debug_toolbar/panels/sql/utils.py	92.15% <100.00%> (ø)
debug_toolbar/panels/sql/views.py	91.04% <100.00%> (ø)
debug_toolbar/panels/templates/panel.py	89.51% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8de6921...3eff33d. Read the comment docs.

[tim-schilling]

This is super cool!

[matthiask]

Thanks!

(I wanted to hold off merging this because of #1542 , but they shouldn't affect each other, I hope.)