docs(README): fix dead deno.land/std link

[sanjibani]

Replaces https://deno.land/std (404 — deno.land landing retired) with https://jsr.io/@std (200 — canonical JSR scope for the Standard Library). Clarifies the parenthetical to note that archive copies of older releases (≤0.224.0) live on JSR under the same scope.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.57%. Comparing base (cdf74a8) to head (ff6b3ef).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7188      +/-   ##
==========================================
- Coverage   94.57%   94.57%   -0.01%     
==========================================
  Files         636      637       +1     
  Lines       52142    52150       +8     
  Branches     9401     9401              
==========================================
+ Hits        49315    49319       +4     
- Misses       2249     2254       +5     
+ Partials      578      577       -1     

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