bug fix arange float & tests devices

[mtar]

Description

Issue/s resolved: None

Changes proposed:

• fix dtype of returned DNDarray in arange
• remove old HEAT_TEST_DEVICE values in test_devices

Type of change

• Bug fix (non-breaking change which fixes an issue)

Due Diligence

• All split configurations tested
• Multiple dtypes tested in relevant functions
• Documentation updated (if needed)
• Updated changelog.md under the title "Pending Additions"

Does this change modify the behaviour of other functions? If so, which?

no

[Markus-Goetz]

The fixes seem fine to me, however, the tests are not passing with a float32 != int32 assertion exception

[codecov]

Codecov Report

Merging #638 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #638   +/-   ##
=======================================
  Coverage   97.40%   97.40%           
=======================================
  Files          85       85           
  Lines       16636    16636           
=======================================
  Hits        16204    16204           
  Misses        432      432           

Impacted Files	Coverage Δ
heat/core/factories.py	100.00% <100.00%> (ø)
heat/core/tests/test_devices.py	58.18% <100.00%> (ø)
heat/core/tests/test_factories.py	100.00% <100.00%> (ø)

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