[breaking change] Update edition from 2018 to 2021

[gwenn]

And fix clippy warnings

[codecov]

Codecov Report

Patch coverage: 11.62% and project coverage change: +0.03 🎉

Comparison is base (7278e5f) 81.40% compared to head (ba07f41) 81.44%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1267      +/-   ##
==========================================
+ Coverage   81.40%   81.44%   +0.03%     
==========================================
  Files          49       49              
  Lines        9778     9745      -33     
==========================================
- Hits         7960     7937      -23     
+ Misses       1818     1808      -10     

Impacted Files	Coverage Δ
src/blob/mod.rs	94.68% <ø> (-0.03%)	⬇️
src/column.rs	95.76% <0.00%> (ø)
src/error.rs	27.38% <0.00%> (+1.24%)	⬆️
src/statement.rs	95.00% <0.00%> (-0.49%)	⬇️
src/transaction.rs	93.68% <0.00%> (ø)
src/types/from_sql.rs	65.41% <0.00%> (+0.48%)	⬆️
src/types/mod.rs	95.71% <0.00%> (ø)
src/types/url.rs	93.47% <0.00%> (ø)
src/util/sqlite_string.rs	83.33% <ø> (ø)
src/vtab/csvtab.rs	70.17% <0.00%> (+2.66%)	⬆️
... and 4 more

... and 5 files with indirect coverage changes

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