switch to sha1 from sha224

[shikokuchuo]

Prework

• I understand and agree to the Contributor Code of Conduct.
• I have already submitted a discussion topic or issue to discuss my idea with the maintainer.

Related GitHub issues and pull requests

• Ref: Faster hashing from nanonext? ropensci/targets#1036

Summary

Submitting this PR to implement: ropensci/targets#1036 (comment)

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@7ffec51). Click here to learn what that means.
Patch coverage: 100.00% of modified lines in pull request are covered.

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Additional details and impacted files

@@           Coverage Diff            @@
##             main       #59   +/-   ##
========================================
  Coverage        ?   100.00%           
========================================
  Files           ?        21           
  Lines           ?       862           
  Branches        ?         0           
========================================
  Hits            ?       862           
  Misses          ?         0           
  Partials        ?         0           

Impacted Files	Coverage Δ
R/utils_names.R	100.00% <100.00%> (ø)

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[wlandau]

Thanks, @shikokuchuo!