🔧 Convert state.srcCharCode -> state.src

[chrisjsewell]

state.srcCharCode is deprecated in markdown-it-py v3, and so here we pre-emptively replace all incidences to state.src, i.e. using the string instead of the unicode integer.

[codecov]

Codecov Report

Patch coverage: 97.05% and project coverage change: -0.11 ⚠️

Comparison is base (85f7ed3) 92.80% compared to head (b6e5c52) 92.70%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #84      +/-   ##
==========================================
- Coverage   92.80%   92.70%   -0.11%     
==========================================
  Files          31       31              
  Lines        1779     1781       +2     
==========================================
  Hits         1651     1651              
- Misses        128      130       +2     

Flag	Coverage Δ
pytests	92.70% <97.05%> (-0.11%)	⬇️

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Impacted Files	Coverage Δ
mdit_py_plugins/colon_fence.py	94.59% <86.66%> (-2.29%)	⬇️
mdit_py_plugins/attrs/index.py	92.10% <100.00%> (-0.07%)	⬇️
mdit_py_plugins/container/index.py	96.87% <100.00%> (-0.04%)	⬇️
mdit_py_plugins/deflist/index.py	94.28% <100.00%> (-0.09%)	⬇️
mdit_py_plugins/dollarmath/index.py	91.12% <100.00%> (ø)
mdit_py_plugins/field_list/__init__.py	95.90% <100.00%> (ø)
mdit_py_plugins/footnote/index.py	94.82% <100.00%> (-0.03%)	⬇️
mdit_py_plugins/front_matter/index.py	94.52% <100.00%> (-0.08%)	⬇️
mdit_py_plugins/myst_blocks/index.py	95.60% <100.00%> (ø)
mdit_py_plugins/myst_role/index.py	85.36% <100.00%> (ø)
... and 1 more

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