use load_dataarray instead of open_dataarray for collocateddata

[heikoklein]

Change Summary

avoid hanging file-handles, this crashed newer versions of xarray (which have a bug in the filemanager)

Related issue number

#1149

Checklist

• Start with a draft-PR
• The PR title is a good summary of the changes
• PR is set to AeroTools and a tentative milestone
• Documentation reflects the changes where applicable
• Tests for the changes exist where applicable
• Tests pass locally
• Tests pass on CI
• At least 1 reviewer is selected
• Make PR ready to review

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.69%. Comparing base (92f4878) to head (996815c).
Report is 5 commits behind head on main-dev.

❗ Current head 996815c differs from pull request most recent head 5d64e25. Consider uploading reports for the commit 5d64e25 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##           main-dev    #1150   +/-   ##
=========================================
  Coverage     78.69%   78.69%           
=========================================
  Files           127      127           
  Lines         20090    20090           
=========================================
  Hits          15809    15809           
  Misses         4281     4281           

Flag	Coverage Δ
unittests	78.69% <100.00%> (ø)

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[thorbjoernl]

LGTM 🚀 🧨