Update dependency davecom/SwiftGraph to v4

[renovate]

This PR contains the following updates:

Package	Update	Change
davecom/SwiftGraph	major	from: "3.1.0" → from: "4.0.0"

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Release Notes

davecom/SwiftGraph (davecom/SwiftGraph)

v4.0.0

Compare Source

• This is an API breaking change due to addEdge() changes
• addEdge(_ e: E, directed: Bool) deprecated in favor of just addEdge(_ e: E) since Edge already has a directed property (@​Vithanco)
• Fix generic parameter name shadowing for Swift 6 compatibility
• Count paths between vertices (@​sbeitzel)
• Improve performance of detectCycles() (@​automaciej)
• Indegree and Outdegree methods (@​TizianoCoroneo)

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