Update Guice to 5.0.1

This (aside from removal of deprecated methods) is the only notable API break in Velocity 3.0.0.

api/build.gradle

@@ -38,7 +38,7 @@ dependencies {
     api("net.kyori:adventure-text-serializer-plain")
 
     api "org.slf4j:slf4j-api:${slf4jVersion}"
-    api 'com.google.inject:guice:4.2.3'
+    api 'com.google.inject:guice:5.0.1'
     api "org.checkerframework:checker-qual:${checkerFrameworkVersion}"
     api 'com.velocitypowered:velocity-brigadier:1.0.0-SNAPSHOT'
 
@@ -82,8 +82,8 @@ javadoc {
     options.links(
             'http://www.slf4j.org/apidocs/',
             'https://google.github.io/guava/releases/25.1-jre/api/docs/',
-            'https://google.github.io/guice/api-docs/4.2/javadoc/',
-            'https://docs.oracle.com/javase/8/docs/api/',
+            'https://google.github.io/guice/api-docs/5.0.1/javadoc/',
+            'https://docs.oracle.com/javase/11/docs/api/',
             'https://jd.adventure.kyori.net/api/4.7.0/'
     )