fix: keep minecraft coldstarters idle

[MarcStdt]

Summary

• remove keepAliveTraffic from PaperMC coldstarter expected ports
• remove keepAliveTraffic from Spigot coldstarter expected ports
• regenerate affected Minecraft scrolls from templates

Tests

• GOCACHE=/private/tmp/druid-go-cache make build-tree
• GOCACHE=/private/tmp/druid-go-cache go run ./scripts/validate-scrolls.go
• GOCACHE=/private/tmp/druid-go-cache go test ./scripts/prebuild
• GOCACHE=/private/tmp/druid-go-cache ./scripts/validate_all_scrolls.sh
• GOCACHE=/private/tmp/druid-go-cache go run ./scripts/validate-release-workflow
• GOCACHE=/private/tmp/druid-go-cache go test ./scripts/validate-release-workflow
• git diff --check

[druid-infra]

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