Don't automatically include {fmt}

[mborland]

Closes: #1113

[cppalliance-bot]

An automated preview of the documentation is available at https://1124.decimal.prtest3.cppalliance.org/libs/decimal/doc/html/index.html

If more commits are pushed to the pull request, the docs will rebuild at the same URL.

2025-10-13 11:30:37 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.4%. Comparing base (4d0c7e2) to head (fae4ed4).
⚠️ Report is 12 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #1124     +/-   ##
=========================================
+ Coverage     99.4%   99.4%   +0.1%     
=========================================
  Files          246     246             
  Lines        16778   16778             
  Branches      1812    1812             
=========================================
+ Hits         16671   16672      +1     
+ Misses         107     106      -1     

Files with missing lines	Coverage Δ
test/test_format_fmtlib.cpp	100.0% <ø> (ø)

... and 1 file with indirect coverage changes

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