Fix weird intellij issues with mixin's annotation processor

- Update forge/mixin version

build.gradle

@@ -103,7 +103,12 @@ dependencies {
 
     //implementation 'org.joml:joml:1.10.1'
 
-    annotationProcessor 'org.spongepowered:mixin:0.8.4:processor'
+    // https://discord.com/channels/313125603924639766/725850371834118214/910619168821354497
+    // Prevent Mixin annotation processor from getting into IntelliJ's annotation processor settings
+    // This allows 'Settings > Build, Execution, and Deployment > Build Tools > Gradle > Build and run using' set to IntelliJ to work correctly
+    if (System.getProperty('idea.sync.active') != 'true') {
+        annotationProcessor "org.spongepowered:mixin:${mixin_version}:processor"
+    }
 }
 
 // Example for how to get properties into the manifest for reading by the runtime..

gradle.properties

@@ -5,11 +5,12 @@ org.gradle.daemon = false
 mod_version = 0.3.0
 mc_update_version = 1.17
 minecraft_version = 1.17.1
-forge_version = 37.0.117
+forge_version = 37.1.0
 
 # build dependency versions
 forgegradle_version = 5.1.+
 mixingradle_version = 0.7-SNAPSHOT
+mixin_version = 0.8.5
 librarian_version = 1.+
 cursegradle_version = 1.4.0
 parchment_version = 2021.10.31