Replace deserialize_any with deserialize_str in serde macro

[xamgore]

Fixes the same issue as in #466

[codecov[bot]]

Codecov Report

Merging #587 (21c8d45) into main (0e99ae7) will not change coverage. The diff coverage is 100.0%.

@@          Coverage Diff          @@
##            main    #587   +/-   ##
=====================================
  Coverage   95.8%   95.8%           
=====================================
  Files         79      79           
  Lines       8809    8809           
=====================================
  Hits        8435    8435           
  Misses       374     374           

Impacted Files	Coverage Δ
time-macros/src/serde_format_description.rs	93.9% <100.0%> (ø)

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[jhpratt]

Looks good; thanks!