fix: Make Exa.TrkX example work with CUDA 12

[benjaminhuth]

There seems to be some change in the default device of tensors, this makes it explicit.

[github-actions]

📊 Physics performance monitoring for 21997b2

🟥 ERROR The result has missing elements!
This is likely a physmon job failure

Full report
Seeding: ❌ seeded, ❌ truth estimated, ❌ orthogonal
CKF: ❌ seeded, ❌ truth smeared, ❌ truth estimated, ❌ orthogonal
IVF: ❌ seeded, ❌ truth smeared, ❌ truth estimated, ❌ orthogonal
Ambiguity resolution: ❌ seeded, ❌ orthogonal
❌ Truth tracking
❌ Truth tracking (GSF)

Vertexing ❌

❌ Vertexing vs. mu

❌ IVF seeded

❌ IVF truth_smeared

❌ IVF truth_estimated

❌ IVF orthogonal

Seeding ❌

❌ Seeding seeded

❌ Seeding truth_estimated

❌ Seeding orthogonal

CKF ❌

❌ CKF seeded

❌ CKF truth_smeared

❌ CKF truth_estimated

❌ CKF orthogonal

Ambiguity resolution ❌

❌ seeded

Truth tracking (Kalman Filter) ❌

❌ Truth tracking

Truth tracking (GSF) ❌

❌ Truth tracking

[codecov]

Codecov Report

Merging #2087 (b4d838c) into main (6a0cb8a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2087   +/-   ##
=======================================
  Coverage   49.31%   49.31%           
=======================================
  Files         427      427           
  Lines       24828    24828           
  Branches    11444    11444           
=======================================
  Hits        12245    12245           
  Misses       4514     4514           
  Partials     8069     8069           

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