10.05 08:08:27 [Server] [PvPManager] The updater could not contact dev.bukkit.org for updating.
10.05 08:08:27 [Server] [PvPManager] If you have not recently modified your configuration and this is the first time you are seeing this message, the site may be experiencing temporary downtime.
10.05 08:08:27 [Server] java.io.IOException: Server returned HTTP response code: 403 for URL: https://api.curseforge.com/servermods/files?projectIds=63773
10.05 08:08:27 [Server] at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1985)
10.05 08:08:27 [Server] at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1577)
10.05 08:08:27 [Server] at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:224)
10.05 08:08:27 [Server] at PvPManager.jar//me.NoChance.PvPManager.Libraries.Updater.BukkitUpdater.read(BukkitUpdater.java:73)
10.05 08:08:27 [Server] at PvPManager.jar//me.NoChance.PvPManager.Libraries.Updater.Updater.runUpdater(Updater.java:55)
10.05 08:08:27 [Server] at PvPManager.jar//me.NoChance.PvPManager.Libraries.Updater.Updater$1.run(Updater.java:44)
10.05 08:08:27 [Server] INFO [PvPManager] No update found

Plugin and Server version
Latest paper server, pvp manager 3.9.4

It looks as though its looking for an update but not finding one, not sure if this is that much of an issue/minor issue.

This can be ignored, the curseforge API to check for updates probably had some temporary issue