SYN-6716: it:sec:cpe issues when converting from 2.2->2.3 and 2.3->2.2

[MichaelSquires]

bugfix: Updated CPE code to support better conversions from 2.2->2.3 and vice versa

[codecov]

Codecov Report

Attention: Patch coverage is 99.23077% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 97.63%. Comparing base (53377ff) to head (23363fa).

Files	Patch %	Lines
synapse/models/infotech.py	98.86%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3515      +/-   ##
==========================================
+ Coverage   95.90%   97.63%   +1.73%     
==========================================
  Files         237      237              
  Lines       50619    50869     +250     
==========================================
+ Hits        48547    49667    +1120     
+ Misses       2072     1202     -870     

Flag	Coverage Δ
linux	97.63% <99.23%> (+9.25%)	⬆️
linux_replay	?

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