Update version strings to indicate 1.18.1 support

Geyser 1.18 builds already support 1.18.1.

core/src/main/java/org/geysermc/geyser/network/MinecraftProtocol.java

@@ -91,7 +91,7 @@ public final class MinecraftProtocol {
      * @return the supported Minecraft: Java Edition version name
      */
     public static String getJavaVersion() {
-        return DEFAULT_JAVA_CODEC.getMinecraftVersion();
+        return "1.18 - 1.18.1";
     }
 
     /**

core/src/main/java/org/geysermc/geyser/text/MinecraftLocale.java

@@ -71,7 +71,7 @@ public class MinecraftLocale {
                 // Get the url for the latest version of the games manifest
                 String latestInfoURL = "";
                 for (Version version : versionManifest.getVersions()) {
-                    if (version.getId().equals(MinecraftProtocol.getJavaVersion())) {
+                    if (version.getId().equals(MinecraftProtocol.getJavaCodec().getMinecraftVersion())) {
                         latestInfoURL = version.getUrl();
                         break;
                     }