feat: add retries to grammar

[maarten-k]

snakemake 7.7 introduces the retries keyword. This pull request makes snakefmt also recognise this keyword.

[mbhall88]

Thanks @maarten-k. Can you please also push the updated poetry.lock file? If you aren't using poetry, I can always add this in with #136

[codecov]

Codecov Report

Merging #145 (83ceb49) into master (d233dfa) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #145   +/-   ##
=======================================
  Coverage   98.20%   98.20%           
=======================================
  Files          12       12           
  Lines         949      949           
  Branches      211      211           
=======================================
  Hits          932      932           
  Misses         10       10           
  Partials        7        7           

Flag	Coverage Δ
unittests	98.10% <ø> (ø)

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Impacted Files	Coverage Δ
snakefmt/parser/grammar.py	100.00% <ø> (ø)

[mbhall88]

@maarten-k, if it's okay with you, I might move this over to #136 as I don't want to mess with the commits from dev I've already pulled in on that PR

[maarten-k]

@maarten-k, if it's okay with you, I might move this over to #136 as I don't want to mess with the commits from dev I've already pulled in on that PR

That is perfect.