tolerate "H" for hard derivation in message signing

[jdlcdl]

Description

Noticed tolerance for different "hardened" derivation paths including "'" and "h" but not "H", just in case a message signing request comes in a file like:

Hello World from Sparrow 2.0.0 signed on krux pr_453
m/84'/1h/1H/0/20
P2WPKH

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

[codecov-commenter]

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Additional details and impacted files

@@                   Coverage Diff                   @@
##             system_optimizations      #44   +/-   ##
=======================================================
  Coverage                        ?   94.67%           
=======================================================
  Files                           ?       70           
  Lines                           ?     7575           
  Branches                        ?        0           
=======================================================
  Hits                            ?     7172           
  Misses                          ?      403           
  Partials                        ?        0           

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[odudex]

Thank you!