misc: make xDSL version getting lazy

[superlopuh]

This was just annoying me when looking at traces, we pay the cost of the version function even when we're not going to use it (6ms on my laptop).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.19%. Comparing base (c9493b7) to head (1433189).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4012   +/-   ##
=======================================
  Coverage   90.19%   90.19%           
=======================================
  Files         458      458           
  Lines       58288    58294    +6     
  Branches     5687     5687           
=======================================
+ Hits        52570    52577    +7     
  Misses       4328     4328           
+ Partials     1390     1389    -1     

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