Lazy loading and update supported python version

[ericpre]

Progress of the PR

• Implement lazy loading using lazy_loader,
• update supported python version,
• [n/a] docstring updated (if appropriate),
• [n/a] update user guide (if appropriate),
• [n/a] added tests,
• add a changelog entry in the upcoming_changes folder (see upcoming_changes/README.rst),
• Check formatting of the changelog entry (and eventual user guide changes) in the docs/readthedocs.org:holospy build of this PR (link in github checks)
• ready for review.

[codecov]

Codecov Report

❌ Patch coverage is 61.22449% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.79%. Comparing base (83a8da3) to head (13726e9).

Files with missing lines	Patch %	Lines
holospy/_version.py	0.00%	13 Missing ⚠️
holospy/signals/hologram_image.py	66.66%	1 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #65      +/-   ##
==========================================
- Coverage   86.66%   83.79%   -2.88%     
==========================================
  Files           7        8       +1     
  Lines         330      327       -3     
  Branches       72       66       -6     
==========================================
- Hits          286      274      -12     
- Misses         26       37      +11     
+ Partials       18       16       -2     

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