Update turtledash

[corrideat]

Update turtledash dependency to correct possible prototype pollution.

There's also an update to @apeleghq/multipart-parser with some minor improvements, but none of them are relevant to @chelonia/lib (they've got to do with nested multipart messages, which aren't used here), so 1.0.18 is kept.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	turtledash@​1.0.2 ⏵ 1.0.3	+1		+1	+5

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