Read scanning size for recent empad dataset

[ericpre]

Close #2755.

Progress of the PR

• Fix parsing scanning size for empad dataset acquired with software version 1.2.0
• add an changelog entry in the upcoming_changes folder (see upcoming_changes/README.rst),
• add tests,
• ready for review.

[ericpre]

@xiongh15 this pull request should fix the issue you reported in #2755.

If you are comfortable with installing a development version of python library, you can do it running the following command:

pip install https://github.com/ericpre/hyperspy/archive/refs/heads/fix_empad_v1.2.0.zip

If not, better to wait that this fix is included in a release version.

[codecov]

Codecov Report

Merging #2757 (1518ae6) into RELEASE_next_patch (6d184cd) will increase coverage by 0.00%.
The diff coverage is 66.66%.

@@                 Coverage Diff                 @@
##           RELEASE_next_patch    #2757   +/-   ##
===================================================
  Coverage               77.30%   77.30%           
===================================================
  Files                     202      202           
  Lines                   30032    30034    +2     
  Branches                 6561     6562    +1     
===================================================
+ Hits                    23216    23218    +2     
  Misses                   5068     5068           
  Partials                 1748     1748           

Impacted Files	Coverage Δ
hyperspy/io_plugins/empad.py	93.68% <66.66%> (+0.13%)	⬆️

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[jlaehne]

LGTM