BuildToolsError

[--nogui, --rev, 1.10, --remapped, --generate-docs, --disable-certificate-check, --output-dir, C:\Users\ferna\Desktop\Programming\Java\mine-plugins\DragonSlayer]
Loading BuildTools version: git-BuildTools-5411f5b-186 (#186)
Java Version: Java 8
Current Path: C:\Users\ferna\Downloads
*** Using downloaded git PortableGit-2.45.2-64-bit\PortableGit ***
*** Please note that this is a beta feature, so if it does not work please also try a manual install of git from https://git-for-windows.github.io/ ***
git version 2.45.2.windows.1
java version "1.8.0_51"
Java(TM) SE Runtime Environment (build 1.8.0_51-b16)
Java HotSpot(TM) 64-Bit Server VM (build 25.51-b03, mixed mode)
Attempting to build version: '1.10' use --rev <version> to override
Found version
{
	"name": "986a",
	"description": "Jenkins build 986a",
	"refs": {
		"BuildData": "f37e6395d8f7d4865df27a4ab77e0c0d45de8fb9",
		"Bukkit": "570e0e67528698b67770ea12e22c82d937fd3080",
		"CraftBukkit": "e669d325d7341741efa8a2a15347235b823aeb52",
		"Spigot": "de459a282d9f494bbc5588b461b3e8eacd74f744"
	},
	"toolsVersion": 47
}

Maven does not exist, downloading. Please wait.
Starting download of https://dlcdn.apache.org/maven/maven-3/3.9.6/binaries/apache-maven-3.9.6-bin.zip
Exception in thread "main" java.io.IOException: Server returned HTTP response code: 421 for URL: https://dlcdn.apache.org/maven/maven-3/3.9.6/binaries/apache-maven-3.9.6-bin.zip
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source)
	at java.net.URL.openStream(Unknown Source)
	at com.google.common.io.Resources$UrlByteSource.openStream(Resources.java:70)
	at com.google.common.io.ByteSource.read(ByteSource.java:296)
	at com.google.common.io.Resources.toByteArray(Resources.java:96)
	at org.spigotmc.builder.Builder.download(Builder.java:1152)
	at org.spigotmc.builder.Builder.startBuilder(Builder.java:335)
	at org.spigotmc.builder.Bootstrap.main(Bootstrap.java:60)