Fix device bug in get_degree_histogram

[DamianSzwichtenberg]

This PR fixes the following error:
RuntimeError: Expected all tensors to be on the same device, but found at least two devices, xpu:0 and cpu!
deg_histogram now inherits the device type from edge_index.

[codecov]

Codecov Report

Merging #7830 (b31595a) into master (0c0d9c1) will decrease coverage by 0.63%.
Report is 3 commits behind head on master.
The diff coverage is 100.00%.

❗ Current head b31595a differs from pull request most recent head 05be2b5. Consider uploading reports for the commit 05be2b5 to get more accurate results

@@            Coverage Diff             @@
##           master    #7830      +/-   ##
==========================================
- Coverage   90.44%   89.81%   -0.63%     
==========================================
  Files         455      455              
  Lines       26334    26332       -2     
==========================================
- Hits        23818    23651     -167     
- Misses       2516     2681     +165     

Files Changed	Coverage Δ
torch_geometric/nn/conv/pna_conv.py	100.00% <100.00%> (ø)

... and 30 files with indirect coverage changes

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