Update dependency org.spigotmc:spigot-api to v1.20-R0.1-SNAPSHOT

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.spigotmc:spigot-api	1.9.4-R0.1-SNAPSHOT -> 1.20-R0.1-SNAPSHOT

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