Use pyupgrade on the pre-commit hooks

[mwouts]

Inspired by #907

[codecov]

Codecov Report

Merging #920 (17225b4) into main (923de7e) will increase coverage by 0.02%.
The diff coverage is 98.97%.

@@            Coverage Diff             @@
##             main     #920      +/-   ##
==========================================
+ Coverage   98.95%   98.98%   +0.02%     
==========================================
  Files         116      117       +1     
  Lines       10823    10845      +22     
==========================================
+ Hits        10710    10735      +25     
+ Misses        113      110       -3     

Impacted Files	Coverage Δ
tests/test_mirror.py	100.00% <ø> (ø)
tests/test_pre_commit_scripts.py	100.00% <ø> (ø)
tests/test_read_simple_R.py	100.00% <ø> (ø)
tests/test_read_simple_clojure.py	100.00% <ø> (ø)
tests/test_read_simple_groovy.py	100.00% <ø> (ø)
tests/test_read_simple_hydrogen.py	100.00% <ø> (ø)
tests/test_read_simple_java.py	100.00% <ø> (ø)
tests/test_read_simple_pandoc.py	100.00% <ø> (ø)
tests/test_read_simple_percent.py	100.00% <ø> (ø)
tests/test_read_simple_python.py	100.00% <ø> (ø)
... and 30 more

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