fix: remove warning on MacOS build coming from DigitizationCell

[asalzburger]

Title says it all.

[codecov]

Codecov Report

Merging #2064 (ff1e2be) into main (39072d0) will not change coverage.
The diff coverage is n/a.

❗ Current head ff1e2be differs from pull request most recent head 7710b2e. Consider uploading reports for the commit 7710b2e to get more accurate results

@@           Coverage Diff           @@
##             main    #2064   +/-   ##
=======================================
  Coverage   49.37%   49.37%           
=======================================
  Files         427      427           
  Lines       24779    24779           
  Branches    11430    11430           
=======================================
  Hits        12234    12234           
  Misses       4484     4484           
  Partials     8061     8061           

Impacted Files	Coverage Δ
...ore/include/Acts/Digitization/DigitizationCell.hpp	100.00% <ø> (ø)

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[github-actions]

📊 Physics performance monitoring for 7710b2e

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