Data.update() functionality

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #6313 (2f64cb1) into master (e27d935) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 2f64cb1 differs from pull request most recent head 2992fd6. Consider uploading reports for the commit 2992fd6 to get more accurate results

@@           Coverage Diff           @@
##           master    #6313   +/-   ##
=======================================
  Coverage   84.38%   84.39%           
=======================================
  Files         381      381           
  Lines       21259    21269   +10     
=======================================
+ Hits        17939    17949   +10     
  Misses       3320     3320           

Impacted Files	Coverage Δ
torch_geometric/data/data.py	89.07% <100.00%> (+0.11%)	⬆️
torch_geometric/data/hetero_data.py	89.91% <100.00%> (+0.10%)	⬆️

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