Bump nbconvert from 5.6.1 to 6.3.0 in /testing/scripts

[dependabot[bot]]

Bumps nbconvert from 5.6.1 to 6.3.0.

Commits

• cefe0bf Release 6.3.0
• a534fb9 Release 6.3.0b0
• 87920c5 Add changelog for 6.3.0 (#1669)
• dd6d9c7 add slide numbering (#1654)
• 5d2c5e2 Update state filter (#1664)
• 11ea593 fix: avoid closing the script tag early by escaping a forward slash (#1665)
• 968c5fb Fix HTML templates mentioned in help docs (#1653)
• 35c4d07 Add a new output filter that excludes widgets if there is no state (#1643)
• c663c75 6.2.0
• fd1dd15 6.2.0rc2
• Additional commits viewable in compare view

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[seldondev]

Hi @dependabot[bot]. Thanks for your PR.

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[seldondev]

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[dependabot[bot]]

Superseded by #4297.