Fix loop leaks

[tonybaloney]

• Fixes a leak in the asctime field of log record
• Fixes a leak in stream writer write() and flush() calls
• Fixes a leak in stream close()

[codecov-commenter]

Codecov Report

Merging #60 (fb5df0c) into main (b08df4b) will decrease coverage by 0.00%.
The diff coverage is 91.66%.

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
- Coverage   86.32%   86.31%   -0.01%     
==========================================
  Files          10       10              
  Lines        1894     1900       +6     
==========================================
+ Hits         1635     1640       +5     
- Misses        259      260       +1     

Impacted Files	Coverage Δ
src/picologging/formatter.cxx	89.04% <50.00%> (-0.62%)	⬇️
src/picologging/logger.cxx	82.33% <100.00%> (+0.04%)	⬆️
src/picologging/streamhandler.cxx	94.20% <100.00%> (+0.35%)	⬆️

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