[Misc] Black auto fix.

[frozenbugs]

Description

Checklist

Please feel free to remove inapplicable items for your PR.

• [ ] The PR title starts with [$CATEGORY] (such as [NN], [Model], [Doc], [Feature]])
• [ ] Changes are complete (i.e. I finished coding on this PR)
• [ ] All changes have test coverage
• [ ] Code is well-documented
• [ ] To the best of my knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change
• [ ] Related issue is referred in this PR
• [ ] If the PR is for a new model/paper, I've updated the example index here.

Changes

[dgl-bot]

To trigger regression tests:

• @dgl-bot run [instance-type] [which tests] [compare-with-branch]; For example: @dgl-bot run g4dn.4xlarge all dmlc/master or @dgl-bot run c5.9xlarge kernel,api dmlc/master

[dgl-bot]

Commit ID: cfb753aa22ede363aa5fed78530f204bc20dfe62

Build ID: 1

Status: ❌ CI test failed in Stage [Torch CPU Tutorial test].

Report path: link

Full logs path: link

[dgl-bot]

Commit ID: 336457aa17d989f9fd06794837057d047220fbee

Build ID: 2

Status: ❌ CI test failed in Stage [PyTorch Cugraph GPU Unit test].

Report path: link

Full logs path: link