Bump gatsby from 2.23.20 to 2.23.21

[dependabot-preview[bot]]

Bumps gatsby from 2.23.20 to 2.23.21.

Commits

• 77a6f04 chore(release): Publish
• be78563 fix(gatsby): correctly pass through exit signals from child process (#25520)
• 20daeca chore(docs): added some parenthesis (#25543)
• b5926cc fix linting for langauges page (#25518)
• d4fe002 added false as default assignment to isExpanded property (#24367)
• c4920a3 WIP: Implement languages page (#21882)
• f813909 remove local domain, add plugin name in code fences (#25514)
• 6c91587 enhancement(www): custom DocPage node type. (#25278)
• e32f7aa chore(starters): add gatsby-three-ts-plus (#25296)
• a5459bc fix(gatsby-transformer-sharp): removed unnecessary conversion to webp (#25325)
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #84.